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题型:阅读理解-阅读单选 难度:0.85 引用次数:101 题号:20085919

A device that stops drivers from falling asleep at the wheel is about to undergo testing at Department of Transport laboratories and could go on sale within 12 months.

The system, called Driver Alert, aims to reduce deadly road accidents by 20%-40% that are caused by tiredness. Airline pilots can also use it to reduce the 30% of all pilot-error accidents that are related to fatigue.

Driver Alert is based on a computerized wristband. The device, worn by drivers or pilots, gives out a sound about every four minutes during a car journey. After each sound the driver must respond by squeezing the steering wheel (方向盘). A sensor in the wristband detects this pressing action and measures the time between the sound and the driver’s response.

Tiredness is directly related to a driver’s response time. Usually, a watchful driver would take about 400 milliseconds to respond but once that falls to more than 500 milliseconds, it suggests that the driver is getting sleepy.

In such cases the device gives out more regular and louder sounds, showing that the driver should open a window or stop for a rest. If the driver’s response continues to slow down, the sounds become more frequent until a nonstop alarm warns that the driver must stop as soon as possible.

The device has been delivered to the department’s laboatories for testing. If these tests, scheduled for six months’ time, are successful, the makers will bring the product to market within about a year.

1. According to the text, Driver Alert____________.
A.aims to reduce tiredness-related accidents
B.has gone through testing at laboratories
C.aims to prevent drivers from sleeping
D.has been on sale for 12 months
2. How should a driver respond to the sounds from Driver Alert?
A.By sounding a warning.B.By pressing the steering wheel.
C.By checking the driving time.D.By touching the wristband.
3. When the driver gets sleepy while driving, Driver Alert ____________.
A.moves more regularlyB.stops working properly
C.sounds more frequently and loudlyD.opens the window for the driver

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China is going green. In order to reduce air pollution and oil shortages, carmakers have announced their plans to develop hybrid vehicles (混合燃料汽车) for the Chinese market. Toyota’s hybrid car Prius will be ready to drive in China this week. Let’s have a look at the new car.

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The computer decides when to use the gas engine, when to go electric, and when to use a combination of the two. If you go over 24km/h, when you step on the gas pedal (油门), you are telling the computer how fast you want to go.

The electric motor recharges automatically using a set of batteries. And when driving at a high speed, the gas engine not only powers the car but also recharges the batteries. When you use the brake, the electric motor in the wheels will work like a generator (发电机) to produce electricity to recharge the batteries. As a result, the car’s batteries will last for around 200,000 miles.

1. The underlined sentence probably means ________.
A.there will be more and more green land in China
B.China’s new cars are combinations of different green models
C.China is still young and lacking in experience
D.the environment is getting better in China
2. What is the most important feature of hybrid cars?
A.They are powered by both a rechargeable battery and gas.
B.They have smaller engines than traditional gas ones.
C.They only use 99 percent of their power to run up hill.
D.They are much quieter than traditional cars.
3. We can know from the story that ________.
A.the gas engine recharges the batteries as well as powering the car
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D.the batteries can be recharged at any time you want
4. The author writes the passage mainly to________.
A.announce plans to develop hybrid vehicles for the Chinese market
B.let people know how to save their gas when driving a car
C.teach people how to drive a hybrid car
D.introduce a new kind of “green” car
5. Which of the following statements is TRUE according to the text?
A.The hybrid car is environmentally friendly.
B.The hybrid car is unable to get itself recharged.
C.The hybrid car has been made in mass.
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【推荐2】When John Todd was a child, he loved to explore the woods around his house, observing how nature solved problems. A dirty stream, for example, often became clear after flowing through plants and along rocks where tiny creatures lived. When he got older, John started to wonder if this process could be used to clean up the messes people were making.

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1. What is special about Snapchat Spectacles?
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