【正确答案】
C
【答案解析】[听力原文] When a sleepy driver has trouble in keeping his eyes on the road and gets too close to another car, analarm will sound to warn the driver. If nothing is done,the car will automatically come to a stop and in thisway prevent an accident. This is a new device whichwill soon be tested in an experimental car in Japan.The computer warning system keeps track of a driver'scondition by monitoring his heartbeat with signalstransmitted from a band around his wrist. The wrist bandrecords the driver's pulse which measures the heartbeat.Each pulse in the wrist sends a signal to the computer.By analyzing the pulse rate, the computer can determinewhether a driver is drunk, sleeping or ill. Devices inother parts of the car can also tell the computer if the caris too close to another vehicle or is moving dangerously.The computer will sound the alarm when a problemarises, and will automatically stop the car if the driverignores the warning. Why is a computer system installed in an experimental car? 短文开头介绍道：当驾驶员十分困倦，眼睛无法盯着路面从而离其他车辆过近的时候，警报就会响起以提醒驾驶员。如果驾驶员还是没有采取任何措施，车辆就会自动停下来，以避免事故的发生。这从侧面反映了这种系统的作用，那就是预防事故、保护驾驶员的安全，故选C。