【正确答案】
C
【答案解析】[听力原文]26-28
When a sleepy driver has trouble in keeping his eyes on the road and gets too close to another car, an alarm sound will warn the driver. If nothing is done, the car will automatically come to a stop and in this way prevent an accident. This is a new device which will soon be tested in an experimental car in Japan. The computer warning system keeps track of a driver's condition by monitoring his heart beat with signals transmitted from a band round his wrist, The wrist band records the driver's pulse which measures the heart beat. Each pulse in the wrist sends a signal to the computer. By analyzing the pulse rate, the computer can determine whether a driver is drunk, sleeping or ill. Devices in other parts of the car can also tell the computer if the car is too close to another vehicle or is moving dangerously. The computer will sound the alarm when a problem arises, and will automatically stop the car ff the driver ignores the warning.
26. Why is a computer system installed in an experimental car?
因果关系判断题。这是一段介绍车里安装电脑控制系统作用的文章，电脑控制系统的主要作用就是防止意外事故的发生(prevent an accident)。