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Unit 6 When was it invented 阅读单选 专练（含解析）人教新目标（Go for it）版 英语九年级上册
When you do some running, you have a lot of energy which comes from the movement of your body. When you suddenly stop, your body loses this energy. We already have watches and small medical devises (设备) which can use energy that we make when we move. In the future, people like police officers and soldiers may wear devices on their legs to “catch” this lost energy and keep it in batteries (电池). They could use the power for computers, radios or other devices.
In December 2008, most people walking across Hachiko Square, Tokyo, probably did not notice four yellow squares on the road as they hurried to work. The squares were made of special materials that make electricity when they change shape. When people stood on the squares, the shape of the materials changed and they produced electricity. The squares were only there for twenty days, but in that time they produced enough power to make a TV work 1,400 hours! Imagine putting these squares under all the streets in Tokyo. One day, we may turn our streets into power stations!
We can also use body heat. Every day, 250,000 people use Stockholm’s Central Station. They eat and drink, carry heavy bags, and run to catch trains—and their bodies produce a lot of heat when they do these things. Inside the station, the heat is taken from the air and used to heat water for a nearby building.
It is a great way to get free energy—all you need is a lot of people.
1．What provides energy for the watches and small medical devices
A．Electricity in batteries. B．Body movement.
C．Power stations. D．Body temperature.
2．The materials in the four squares produce electricity by changing the _________.
A．shape B．color C．weight D．direction
3．What is Paragraph 3 mainly about
A．The high temperature. B．The hot water service.
C．The use of body heat. D．The crowded station.
4．What can we learn from the passage
A．People power is made good use of now.
B．It’s easy to turn streets into power stations.
C．The use of people power has a bright future.
D．The writer doubts the use of people power.
In India, there are many ironing vendors (熨烫商贩) who press people’s clothes for a living. Their main tool is an iron box powered by charcoal (木炭). India’s Science and Technology Department found out that there are about 10 million ironing carts (手推车) in the country. Each of them uses more than 5 kilograms of charcoal each day, Reuters reported.
After seeing her neighborhood ironing vendors throw the used charcoal away on the street side, Vinisha Umashankar, 15, told NPR that she started to think about the amount of charcoal burned every day and the harm it does to the environment. Burning charcoal gives out greenhouse gases such as carbon dioxide, which leads to climate change.
Vinisha, a student from Tamil Nadu, India, had the idea of ________. She spent six months designing a wheeled cart. The cart has solar panels (太阳能板) which take in sunlight to provide electricity. The rest energy can be stored in a battery for use on cloudy days, according to Time Magazine. Five hours of bright sunshine is enough to operate the iron for six hours.
To complete the invention, Vinisha lost herself in reading college-level physics textbooks to figure out how solar panels work. Then, she reported her idea to the National Innovation Foundation, run by the Indian government. Engineers there helped her build a full-scale working model, NPR reported.
Now, her invention is getting worldwide attention. “I am not just a girl from India. I am a girl from Earth,” Vinisha said in her speech. “All of us should understand that environmental problems are real and can’t be fixed at a later date,” Vinisha continued ,“There is no immediate stop. There are no magic ways.”
5．What does the underlined word “it” in Paragraph3 refer to
A．the burning of charcoal B．the amount of charcoal
C．throwing the charcoal away D．pressing people’s clothes
6．Which of the following is the best to fill in the blank ________ in Paragraph 3
A．offering the ironing vendors better training
B．designing a wheeled cart with the solar panel
C．finding out ways to make full use of charcoal
D．helping the ironing vendors make more money
7．Which of the following words can best describe Vinisha
A．Brave and smart. B．Helpful and creative.
C．Careful and loving. D．Quiet and hard-working.
8．What can we learn from the last sentence of the passage
A．There is no end to the environmental problems.
B．The environmental problems may be solved by magical ways.
C．People think the environmental problems are the biggest enemies.
D．We should take action to do with the environmental problems right away.
9．What’s the purpose of writing this passage
A．To explain how to protect the environment.
B．To tell the story of an Indian girl and her way to success.
C．To introduce a green invention used to stop air pollution.
D．To describe an environmental problem caused by charcoal.
ART & TECHNOLOGY SUMMER CAMP In the art & technology summer camp students will learn the basics of programming by playing games which require them to write code. The camp will be an enjoyable experience for creative young minds who are interested in technology and want to expand their artistic skills. THERE WILL BE —APP MAKING —ROBOTS TO BE PROGRAMMED —AND MANY MORE EXCITING ACTIVITIES! AGES 6 TO 8 AGES 9 TO 12 11 A．M.—1 P.M. $150 PER WEEK 9 A．M.—11 A．M. $150 PER WEEK COMBO WITH ART AROUND THE WORLD $250 PER WEEK *AFTERCARE AVAILABLE:1—6 P.M.$50/WEEK STARTS: 18TH JUNE ENDS: 21ST JULY MET INTERNATIONAL SCHOOL 3465 NW 2nd Ave 305-576-6070
10．The summer camp is mainly designed for ________.
A．active kids of all ages
B．creative kids who like technology
C．kids with busy parents
D．kids who are good at programming
11．The camp lasts about _________.
A．a week B．two weeks
C．a month D．a term
12．Students are required to _________ when they play games.
A．write code B．draw pictures
C．program robots D．develop software
13．If you want to contact the school for more details about the camp, you can _________.
A．call them B．visit their website
C．email them D．send them messages
14．Tom wants a combo and he has to stay at the camp until 6 p.m. How much should he pay per week
A．$150. B．$200.
C．$250. D．$300.
15．Which of the following might be a camper’s review
A．At first it was hard, but I soon started to enjoy it. Now I’ve lost weight and I am healthier!
B．I’m happy to meet other kids that have similar interest in being creative through films.
C．Attending the camp helped me get familiar with new technologies such as creating apps and programming.
D．MET Camp makes art creating fun. I tried everything from musical theatre to painting. I can’t wait to return!
Inventions usually make a big difference to people’s lives. Do you have any great inventions at home Do they help you a lot in your life or bring you much fun Here are some of the most useful inventions in families according to a survey (调查).
The most helpful and creative invention for kids is the reading pen. With the specially-designed pen, kids find it easy and fun to learn. Little kids can learn a lot including story-telling, poems and music. They start learning by touching the contents (内容) in the books with the pen. Kids can learn by themselves in this way.
Mopping robots are popular with people who are too busy to do housework. They are more popular with office ladies. They can help people clean dirt and hair easily. With their help, people don’t need to spend much time on housework. They can enjoy a more relaxing, life after work.
As for old people, an electric foot basin is the best invention. It’s a good choice to buy one for your grandparents. It can help keep their blood pressure(血压) normal(正常的) and improve blood circulation. The special basin can keep the water warm, so washing feet with it will make old people healthier and more relaxed.
Another popular invention is the home projector (投影仪). The machine is light, so it can be moved freely at home. The whole family can watch movies at any time, just like watching in the cinema. Also, the machine is less harmful to eyes. If children take online classes at home, it can reduce the damage (伤害) to the eyes.
16．________ is the most helpful and creative invention for kids.
A．The reading pen B．The mopping robot
C．The electric foot basin D．The home projector
17．If 15-year-old John buys an electric foot basin, he might give it to ________ as a gift.
A．his pretty mother B．his kind grandpa
C．his little brother D．his elder sister
18．What can we know from the passage
A．Electric foot basins can increase people’s blood pressure.
B．Reading pens can help kids learn without touching contents.
C．Mopping robots can help people clean all the rubbish easily.
D．Home projectors can make people watch movies at any time.
The small town of Hay, on the River Wye, sits between England and Wales. It was a quiet place until 1961.That year, a man named Richard Booth came back from a trip to the US with a lot of secondhand books. He bought the town’s old fire station and changed it into a shop to sell them. For the next 10 years, he bought more empty shops and made them into bookshops too. Hay became the world’s first “book town”.
With the money he made, Booth bought the town’s old castle（城堡）. On April 1, 1977, he jokingly called himself King of Hay and said the town was now a country! Some local people thought he was a little crazy.
But he wasn’t crazy at all. The joke made more people come to Hay and buy secondhand books. By the 1980s, there were 1 million books on sale in the town’s over 30 bookshops. Then in 1988 the first literature（文学）festival began in the town. Writers from all over the world came to talk about their new books, along with scientists, reporters and even the President of the US! Now there are book towns in Europe, Australia, Canada and even Malaysia. No one could believe that everything started from the little town with only 1300 people.
19．What can we learn about Booth
A．He wanted to buy more castles. B．He bought the whole town.
C．He called himself the king jokingly. D．He was crazy after selling books.
20．What did writers from all over the world come to the town for
A．Meeting the President of the US. B．Buying things in the old shops.
C．Joining in the literature festival. D．Visiting the town’s old castle.
21．What’s the text mainly about
A．A famous literature festival in 1988. B．A book town and its development.
C．A funny joke about the king of Hay. D．A bookshop selling secondhand books.
The city of Changchun, Jilin province got something special, on Sept 13 — its first 3D-painted bus that gives a feel of diving into the sea and coming into close contact with it.
The idea for the bus, which belongs to the Beida Co, came from Wang Zhi, an employee who took part in its creation competition not long ago, and who comments “I’ve seen 3D buses in other cities and suggested that we have one here.”
The bus, which is also decorated by sea dolls and handicrafts like “dolphins”, and “starfish”, runs from Yanminghu villa to the lakeside street and stops at Beihuancheng Rd. They choose “Sea Tour” as the theme because the color blue and cute creatures might make passengers more relaxed, especially in traffic jams, says Wang.
Mrs. Liu, who is one of the first passengers, says, “It’s marvelous and I feel like I’m diving into the sea.” “I take the bus to work every day and the decoration makes me feel good on the way,” says Zhang Min, a citizen in Changchun.
Some passengers ask the driver for the bus timetable, saying they want to bring their families and friends to enjoy the fun, while the driver, Gu Zhenning, says, “I’m even happier than the passengers working in such a comfortable environment.”
The company says it will promote the use of these buses to make the ride more comfortable and enjoyable.
22．Where did the first 3D-painted bus appear
A．Shanghai. B．Beijing. C．Jilin. D．Zhejiang.
23．What does Wang Zhi do
A．A driver. B．An employee. C．A scientist. D．A doctor.
24．They choose the theme sea tour because ________.
A．they want the passengers to feel more relaxed
B．they want to attract more passengers to take the bus
C．it is the cheapest of all the themes
D．the driver wants the theme sea
25．How does Mrs. Liu feel when she took the bus
A．Sad. B．Crazy. C．Terrible. D．Excited.
26．What’s the best title of the passage
A．A great bus driver B．The first 3D-painted bus in Changchun
C．The theme sea tour D．How to relax on a bus
If you have your own Acme Rocket Launcher, you can create and send up rockets that show off your personality and creativity.
All you need is your Acme Rocket Launcher and a few simple household materials:
★a 500ml plastic cola bottle
★scissors
★colored markers
★poster board
★glue
What to do:
Step 1 Clean the cola bottle completely and allow it to dry.
Step 2 Use markers to draw three small triangles(三角形) and one large triangle on the poster board. Cut out the triangles.
Step 3 Roll(卷起) the large triangle so that two of its sides touch and it forms a rocket’s nose cone. Glue the sides of the cone so that it holds its shape.
Step 4 Glue the nose cone to the bottom of the bottle to make the top of the rocket.
Step 5 Glue the smaller triangles to the other end of the cola bottle, around its opening. The triangles will be the tail fins.
Follow the launching instructions included with your Acme Rocket Launcher and have a blast!
27．The main purpose of the text is to ________.
A．give instructions on making a rocket B．introduce the Acme Rocket Launcher
C．show different kinds of rockets D．teach rocket drawing
28．What can you get from Step 4
A． B． C． D．
29．In which part of a newspaper would you probably read the text
A．Sports News. B．Job Wanted. C．Do It Yourself. D．Lost and Found.
The Aztecs were a native American people who lived in Central American between the 14th and 16th centuries.
The Aztecs were originally from North America, but they migrated south to the area that is now modern Mexico in search of a better place to live.
When the Aztecs first arrived in Central America, they were subjects of the Toltec people who already ruled the area. But, when the Aztecs had been there for about 100 years, they stared to set up their own empire, this empire grew to cover the area that is now Mexico and Guatemala.
30．Where were the Aztecs originally from
A．Latin America.
B．Central America.
C．South America.
D．North America.
31．What was the Aztecs empire set up
A．In the 14th century.
B．In the 15th century.
C．In the 16th century.
D．In the 17th century.
A tiny water-purifying tablet (净水片) powered by the sun comes from scientists at the Stanford University’s Institute for Materials and Energy Science(能源与环境材料研究院). It is about the size of half a postage stamp, and purifies water fast using visible light from the sun’s rays. The invention could let hikers clean their water quickly alone.
Other devices also use the sun’s rays to purify water, but only use UV light, which typically takes several hours to two days to work. The Stanford tablet, on the other hand, takes minutes, UV light only makes up 4 percent of the total solar energy, but visible light makes up 50 percent of solar energy.
Some 663 million people don’t have ways to get water, according to the United Nations, and almost 1,000 children a day die from preventable water-related diseases.
The tablet brought some noticeable early results. In an experiment, it killed 99.999 percent of bacteria (细菌) after200 minutes. It can be physically changed to treat the necessary amount of water, and it’s supposed to cost just a few dollars. The researchers now are testing the device in the real-world environment and hope it could be sold within the next three to five years.
What’s the catch The tablet only works (so far) against bacteria. But the team plans to remove (消除) other pollutants in later tests.
“The easiest water we can treat (right now) is in outside activities, when you get water from the river and the water is not really cloudy or heavily polluted,” Chong Liu, a Stanford researcher, said. “You can pat the device into the water and it can kill the bacteria.”
32．What does the first paragraph tell us about the water-purifying tablet
①What it looks like. ②How it works. ③What it can be used for ④What the price of it is.
A．①③④ B．①②④ C．①②③④ D．①②③
33．Compared with other devices using UV light, the new tablet ________.
A．is much cheaper B．works better without waiting time
C．can process more water D．can make water clean
34．What is the researchers’ attitude towards the future of the device
A．They feel hopeful about it. B．They feel unhappy about it.
C．They doubt the device’s working ability D．They aren’t sure about it.
35．What’s the best title for the passage
A．Many people need clean drinking water. B．Different ways to purify water for hikers.
C．Problems of some water-purifying devices. D．A small tablet may make a big difference.
Engineers in the US have created a group of robots that are able to work together to overcome obstacles（障碍物）.
“When ants collect or carry objects, if one comes upon an obstacle, the group of ants work together to overcome that obstacle,” explained Dr. Ozkan-Aydin, who led the research. “If there’s a gap（裂缝）on the road, for example, they will form a bridge by holding together so the other ants can travel across. That is the inspiration for this study.”
Ozkan-Aydin and her workmates 3D-printed a group of four-legged robots. They have touch sensors（传感器）at the front and back, so that they could sense and connect with other robots in the group. The robots were under tests of finding their way over different surfaces, including grass and rocky ground. Ozkan-Aydin also made some obstacles for them to climb up. If a robot couldn’t find its way out, it would send a signal（信号）to the other robots. Then, they would hold together with their touch sensors.
Ozkan-Aydin said this technology could be used in the future to make groups of robots to help look for people in accidents, carry things over rocky surfaces and do research in dangerous places. However, for that to become true, she says battery（电池） technology will need improving so that the robots can work for up to 10 hours without running out of power.
36．Picture ________ shows the meaning of the underlined sentence.
A． B． C． D．
37．The researcher got the inspiration from ants because they can ________.
A．clean the road B．work together C．work for 10 hours D．carry objects
38．The 3rd paragraph is mainly about ________.
A．how the group of robots work
B．what the group of robots look like
C．how the group of robots can be improved
D．what the group of robots can be used for
39．In the future, the group of robots could be used in the following situations EXCEPT ________.
A．looking for people in accidents B．carrying things over rocky surfaces
C．doing research in dangerous places D．improving battery technology
40．The best title for this article can be _________.
A．Robots with signals B．Robots working like ants
C．Four-legged robots D．3D-printed robots
参考答案：
1．B 2．A 3．C 4．C
【导语】本文主要介绍了得到免费能源的几种方式。
1．细节理解题。根据“When you do some running, you have a lot of energy which comes from the movement of your body”及“We already have watches and small medical devises (设备) which can use energy that we make when we move”可知，身体移动时获得的能量给它们提供能量，故选B。
2．细节理解题。根据“The squares were made of special materials that make electricity when they change shape”可知，改变形状时产生电，故选A。
3．主旨大意题。根据“We can also use body heat”可知，本段主要介绍了身体热量的用处，故选C。
4．推理判断题。根据“It is a great way to get free energy—all you need is a lot of people.”可知，作者认为这是免费获取能量的好方法，只需要许多人就可以做到，由此可推断作者对于人体能量使用的发展抱有很大希望，故选C。
5．A 6．B 7．B 8．D 9．B
【导语】本文是一篇记叙文。文章主要讲述了一个15岁的印度女孩在发现大量的木炭燃烧会危害环境之后，努力设计了用太阳能板提供能量的有轮的手推车的事迹。
5．推理判断题。根据“ Burning charcoal gives out greenhouse gases such as carbon dioxide, which leads to climate change.”可知燃烧木炭释放导致气候变化的温室气体，燃烧木炭危害环境，故此处it指代“燃烧木炭”。故选A。
6．推理判断题。根据“She spent six months designing a wheeled cart. The cart has solar panels which take in sunlight to provide electricity.” 可知她花费了六个月的时间设计了一个有轮的手推车，这个手推车有一个太阳能板。故选B。
7．推理判断题。根据文章可知维迪尼亚看见危害环境的现象之后设法创造性地解决问题，是一个有责任心的、乐于助人的并有创造力的人。故选B。
8．细节理解题。根据“There is no immediate stop. There are no magic ways.”可知没有立刻的终止，没有魔法的办法，只有行动起来，处理环境问题势在必行。故选D。
9．主旨大意题。文章第一段阐述存在的危害环境的现象，为维迪尼亚的出场做好铺垫，然后的几段介绍了维迪尼亚的发明过程和她的思想。故选B。
10．B 11．C 12．A 13．A 14．D 15．C
【导语】本文主要介绍了艺术与技术夏令营的相关信息。
10．细节理解题。根据“The camp will be an enjoyable experience for creative young minds who are interested in technology and want to expand their artistic skills.”（对于那些对科技感兴趣并想拓展艺术技能的年轻创意人士来说，夏令营将是一次愉快的经历。）可知这个夏令营主要是为喜欢科技的有创造力的孩子们设计的。故选B。
11．细节理解题。根据“STARTS: 18TH JUNEENDS”以及“ENDS: 21ST JULY”可知开始时间于6月18日，在7月21日结束，持续约一个月，故选C。
12．细节理解题。根据“In the art & technology summer camp students will learn the basics of programming by playing games which require them to write code.”（在艺术与技术夏令营中，学生们将通过玩需要编写代码的游戏来学习编程的基础知识）可知，A选项正确，故选A。
13．细节理解题。根据“305-576-6070”可知如果你想联系学校了解更多关于夏令营的细节，你可以打电话给他们。故选A。
14．细节理解题。根据“COMBO WITH ART AROUND THE WORLD$250 PER WEEK”以及“*AFTERCARE AVAILABLE:1—6 P.M.$50/WEEK”可知每周总计需要250+50=300美元，故选D。
15．推理判断题。根据“In the art & technology summer camp students will learn the basics of programming by playing games which require them to write code.”（在艺术与技术夏令营中，学生们将通过玩需要编写代码的游戏来学习编程的基础知识。）可知C选项参加这个夏令营帮助我熟悉了一些新技术，比如创建应用程序和编程。”符合，故选C。
16．A 17．B 18．D
【导语】本文是说明文。介绍了几款家庭实用的小发明——阅读笔、扫地机器人、足浴盆和家庭投影仪。
16．细节理解题。根据第一句“The most helpful and creative invention for kids is the reading pen.”可知对孩子们来说，阅读笔是最有帮助、最有创意的发明。故选A。
17．推理判断题。根据第三个表中“As for old people, an electric foot basin is the best invention. It’s a good choice to buy one for your grandparents. ”可知电子足浴盆适合老年人。因此可推断John可能会把它作为礼物送给他的爷爷。故选B。
18．细节理解题。根据最后一个表中“The whole family can watch movies at any time, just like watching in the cinema. ”可知全家人可以在任何时候用投影仪看电影。故选D。
19．C 20．C 21．B
【导语】本文是一篇记叙文。短文主要介绍了位于英格兰和威尔士的边界上的怀伊河畔的图书小镇海伊的发展。
19．细节理解题。根据“On April 1, 1977, he jokingly called himself King of Hay and said the town was now a country!”可知在1977年4月1日，他开玩笑地称自己为海伊之王，还说该镇现在是一个国家。故选C。
20．推理判断题。根据“Then in 1988 the first literature（文学）festival began in the town. Writers from all over the world came to talk about their new books, along with scientists, reporters and even the President of the US!”可知然后在1988年，第一届文学节在这个小镇开始了。来自世界各地的作家都来谈论他们的新书，还有科学家、记者，甚至美国的总统！由此可知他们是来参加文学节的。故选C。
21．主旨大意题。根据“Now there are book towns in Europe, Australia, Canada and even Malaysia. No one could believe that everything started from the little town with only 1300 people.”可知现在在欧洲、澳大利亚、加拿大甚至马来西亚都有了图书城。没有人会相信一切都是从一个只有1300人的小镇开始的。可知短文主要介绍了位于英格兰和威尔士的边界上的怀伊河畔的图书小镇海伊的发展。故选B。
22．C 23．B 24．A 25．D 26．B
【导语】本文讲吉林长春的第一台3D打印巴士进行运营，它让乘客感觉进入一个海洋世界，让乘客在旅途中感到更轻松、更舒服。
22．细节理解题。根据“The city of Changchun, Jilin province got something special, on Sept 13 — its first 3D-painted bus that gives a feel of diving into the sea and coming into close contact with it.”可知第一辆3D打印巴士出现在吉林。故选C。
23．细节理解题。根据“The idea for the bus, which belongs to the Beida Co, came from Wang Zhi, an employee who took part in its creation competition not long ago”可知王志是一名职员。故选B。
24．细节理解题。根据“They choose ‘Sea Tour’ as the theme because the color blue and cute creatures might make passengers more relaxed, especially in traffic jams, says Wang.”可知他们选择“Sea Tour”这个主题是因为他们想让乘客感到更放松。故选A。
25．推理判断题。根据“Mrs. Liu, who is one of the first passengers, says, ‘It’s marvelous and I feel like I’m diving into the sea.’ ”可知刘女士认为乘坐这种巴士很棒，由此推出她乘坐时是兴奋的。故选D。
26．标题归纳题。根据“The city of Changchun, Jilin province got something special, on Sept 13 — its first 3D-painted bus that gives a feel of diving into the sea and coming into close contact with it.”及全文内容可知本文讲吉林长春的第一台3D打印巴士进行运营，它让乘客感觉进入一个海洋世界，让乘客在旅途中感到更轻松、更舒服。用“The first 3D-painted bus in Changchun”做标题最合适。故选B。
27．A 28．D 29．C
【分析】这是一篇说明文，文章介绍火箭发射器制作所需的材料和制作的步骤。
27．主旨大意题。根据“If you have your own Acme Rocket Launcher, you can create and send up rockets that show off your personality and creativity”及“Follow the launching instructions”可知，文章主要是介绍火箭制造的过程。故选A。
28．推理判断题。根据“Glue the nose cone to the bottom of the bottle to make the top of the rocket”可知，要把鼻锥粘在瓶子底部，做成火箭的顶部。与之符合的图片是D选项。故选D。
29．推理判断题。根据“All you need is your Acme Rocket Launcher and a few simple household materials”文章主要是介绍火箭制造的材料及制作的过程。可推知来自报纸的“Do It Yourself自己做东西”版块。故选C。
30．D 31．B
【导语】本文主要讲述了阿兹特克人来自北美，他们是如何建立自己的帝国的。
30．细节理解题。根据“The Aztecs were originally from North America”可知，阿兹特克人最初来自北美，故选D。
31．细节理解题。根据“The Aztecs were a native American people who lived in Central American between the 14th and 16th centuries”可知，阿兹特克人在第十四至第十六世纪居住在中美洲，再根据“when the Aztecs had been there for about 100 years, they stared to set up their own empire”可知，当阿兹特克人在那里待了大约100余年后，他们开始着手建立自己的帝国，所以阿兹特克人在十五世纪建立自己的帝国，故选B。
32．D 33．B 34．A 35．D
【导语】本文介绍了斯坦福大学研发的微型净水片。
32．细节理解题。根据“A tiny water-purifying tablet (净水片) powered by the sun comes from scientists at the Stanford University’s Institute for Materials and Energy Science(能源与环境材料研究院). It is about the size of half a postage stamp, and purifies water fast using visible light from the sun’s rays. The invention could let hikers clean their water quickly alone.”可知第一段介绍净水片的样子、如何工作和用于什么场景的，并没有提到价格。故选D。
33．细节理解题。根据“Other devices also use the sun’s rays to purify water, but only use UV light, which typically takes several hours to two days to work. The Stanford tablet, on the other hand, takes minutes,”可知使用紫外线的过滤需要几个小时到两天，而斯坦福大学的净水片只需要几分钟。故选B。
34．推理判断题。根据“The researchers now are testing the device in the real-world environment and hope it could be sold within the next three to five years.”可知研究人员正在真实世界测试装置，希望能在之后的三到五年售出，因此可推测研究人员对此很有希望。故选A。
35．最佳标题。根据“A tiny water-purifying tablet (净水片) powered by the sun comes from scientists at the Stanford University’s Institute for Materials and Energy Science(能源与环境材料研究院).”和全文可知，本文主要介绍了这款净水片，因此D选项符合。故选D。
36．B 37．B 38．A 39．D 40．B
【导语】本文讲述了工程师们发明的能够共同克服障碍的机器人。
36．细节理解题。根据“If there’s a gap（裂缝）on the road, for example, they will form a bridge by holding together so the other ants can travel across.”可知，如果路上有一个缺口，它们会靠在一起形成一座桥，这样其他蚂蚁就可以穿过去。因此图片中B选项显示了下划线句子的意思。故选B。
37．细节理解题。根据“When ants collect or carry objects, if one comes upon an obstacle, the group of ants work together to overcome that obstacle,”以及“That is the inspiration for this study.”可知，研究人员从蚂蚁身上获得了灵感，因为它们可以一起工作。故选B。
38．主旨大意题。根据第三段“Ozkan-Aydin and her workmates 3D-printed a group of four-legged robots. They have touch sensors（传感器）at the front and back, so that they could sense and connect with other robots in the group. The robots were under tests of finding their way over different surfaces, including grass and rocky ground. Ozkan-Aydin also made some obstacles for them to climb up. If a robot couldn’t find its way out, it would send a signal（信号）to the other robots. Then, they would hold together with their touch sensors.”可知，本段主要讲述了这群机器人如何工作。故选A。
39．细节理解题。根据“Ozkan-Aydin said this technology could be used in the future to make groups of robots to help look for people in accidents, carry things over rocky surfaces and do research in dangerous places.”可知，这项技术在未来可以用于制造机器人群体，帮助寻找事故中的人，在岩石表面搬运物品，以及在危险的地方进行研究，因此没有提及改进电池技术。故选D。
40．最佳标题题。根据第一段“Engineers in the US have created a group of robots that are able to work together to overcome obstacles（障碍物）.”以及结合全文可知，本文主要讲述了机器人组是如何工作的，因此最佳标题应该是B选项“像蚂蚁一样工作的机器人”。故选B。
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