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1、Unit 9 WheelsPart 1阅读完形组合准度练(建议用时40).阅读理解(共8小题；每小题2分，满分16分)ACar companies such as Tesla and Nissan have been leading the way in electric car technology.What makes these cars “green” is that because they run on electricity instead of gasoline，they do not give off any polluting greenhouse gases.The To
2、yota Mirai is also a kind of green car，since it is powered by a hydrogen fuel (氢燃料) battery.Hydrogen，as you know，exists in large quantities on the earth.It was used to power gaslights for centuries before electric lights came along.Hydrogen fuel can be made from many sources including water，natural
3、gas and even rubbish.In terms of energy contained，9.5kg of hydrogen is equal to 25kg of gasoline.According to Toyota，the two tanks on the Mirai hold 5kg of hydrogen，and can cover a distance of over 300 miles.This is twice the output of gasoline cars.In a hydrogen fuel battery，the one proton (质子) and
4、 one electron in a hydrogen atom are broken up.While the electrons power the car，the positivelycharged hydrogen proton combines with the oxygen atom to produce water.The process also produces a lot of heat which turns this water into water vapor.This is the reason that cars running on hydrogen fuel
5、batteries give off water vapor from their exhaust pipes when running.According to Toyota，it takes only 5 minutes to refill a hydrogen tank，which is much quicker than charging electric cars.However，the biggest challenge for the company is the availability of hydrogencharging stations.California and t
6、he New England states are in the process of building a hydrogen superhighwaywith charging stations along the way.Countries like Germany，Japan and UK are also adding more charging stations.The Toyota Mirai will be available in the US.in the second half of 2015 for $58，000.This hydrogenfueled car will
7、 probably take the place of gasoline cars in the near future.After all，it is an energysaving and environmentfriendly car.1According to the text，hydrogen Acan only be used as a fuel for carsBis a newlydiscovered energy sourceCprovides more energy than an equal amount of gasolineDwill soon become the
8、main fuel for most of Toyotas cars2The third paragraph is mainly about Awater vapor and weatherBhow the Toyota Mirai worksCdifferent types of batteriesDwhy hydrogen is very popular3What can we learn about the Toyota Mirai?AIt runs on both gasoline and hydrogen.BIt has become a great threat to electr
9、ic cars.CIt gives off only a few polluting greenhouse gases.DIt may sell well with more charging stations around.4What would be the best title for the text?AA new wave of green carsBThe benefits of electric carsCTesla: a leading car companyDHydrogen: future energy sources【语篇解读】本文是说明文。文章主要介绍了丰田公司即将推出
10、的一款新能源汽车Mirai。1解析：选C。细节理解题。由第二段中的In terms of energy contained，9.5kg of hydrogen is equal to 25 kg of gasoline.可知，同等量的氢比汽油所提供的能量更多。故选C项。2解析：选B。段落大意题。本段主要讲述了丰田这款利用氢燃料电池来驱动的Mirai汽车是如何工作的。故选B项。3解析：选D。推理判断题。由文中多处提及的该车的种种优点和第四段中的the biggest challenge .the availability of hydrogencharging stations可知，如果将来能够
11、配备足够多的充气站，那么该车很可能会销量很好。故选D项。4解析：选A。标题归纳题。本文主要介绍了丰田公司即将推出的一款新能源汽车Mirai。这款利用氢燃料电池来驱动的汽车有着诸多电动汽车所不具备的优点，故用A项作为文章标题最恰当。BWearable sensors (传感器) could one day interpret the gestures in sign language and translate them into English，providing a hightech solution to communication problems between deaf people
12、 and those who dont understand sign language.Engineers at Texas A&M University are developing a wearable device that can sense movement and muscle activity in a persons arms.The device works by figuring out the gestures a person is making by using two sets of sensors: one that responds to the motion
13、 of the wrist and the other to the muscular (肌肉的) movements in the arm.A program then wirelessly receives this information and translates the data into English.“Most of the technology was based on visionbased or camerabased solutions，” said study lead researcher Roozbeh Jafari，an associate professor
14、 at Texas A&M.These existing designs，Jafari said，are not enough，because often when people are talking with sign language，they are using hand gestures combined with specific finger movements，which researchers find it hard to monitor by using existing designs.So they decided that a wearable device was
15、 a better choice.The researchers have built a system that can recognize words that people use most commonly in their daily conversations.Jafari said that once the team starts expanding the program，the engineers will include more words that are less frequently used.One drawback of the system is that
16、it has to be “trained” to respond to each individual that wears the device，Jafari said.This training process involves asking the user to do each hand gesture a couple of times，which can take up to 30 minutes to complete.5Which picture shows the new device developed by Texas A&M University engineers?6The researchers finally decided on a wear
