题目

        A device that stops drivers form 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 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 laboratories for testing. If these tests, scheduled for six months’ time, are successful, the makers will bring the product to market within about a year. 72.     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 form sleeping             D. has been on sale for 12 months 73.   How should a driver respond to the sounds from Driver Alert? A. By sounding a warning.                        B. By touching the wristband. C. By checking the driving time.                D.By pressing the steering wheel. 74.   We can learn form the text that the driver needs to stop for a break when his response time is ____ A. about 400 milliseconds                          B. below 500 milliseconds C. over 500 milliseconds                     D. about 4 minutes 75.   When the driver gets sleepy while driving, Driver Alert ______. A. moves more regularly                           B. stops working properly C. opens the window for the driver         D. sounds more frequently and loudly 答案：72---75    ADCD   解析: 72.解析：这是一道细节推断题。根据第二段“The system， called Driver Alert， aims to reduce deadly road accidents by 20%－40% that are caused by tiredness.”可判断出Driver Alert的目的是减少与疲劳有关的车祸。 73.解析：这是一道细节题。从第三段“After each sound the driver must respond by squeezing the steering wheel.”可以看出司机通过按方向盘的方法来进行反应。 74.解析：这是一道细节推断题。第四段“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.”说明当司机的反应时间超过500毫秒时，司机就必须休息。 75.解析：这是一道细节推断题。根据倒数第二段“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.”可判断出当司机发困时，Driver Alert就会频繁地发出很大的声音。

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