(1)
A)To drive the car automatically.
B)To measure the driver’s pulse.
C)To prevent car accidents.
D)To monitor the driver’s health. (2)
A)It sends out signals for help.
B)It sounds an alarm to warn the driver.
C)It takes over the driving immediately.
D)It stops the car automatically. (3)
A)It monitors the signals transmitted from the driver’s brain.
B)It can measure the driver’s alcohol level in the blood.
C)It can quicken the driver’s response to emergencies.
D)It bases its analysis on the driver’s heartbeat.
原文：
Passage Three
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 he art beat with signals transmitted froin a band round his wrist. The wrist band records the driver's pulse which measures the heart beat. Each pulse in the wri st 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 o r is moving dangerously. The coinputer will sound the alarm when a problem arises, and will automatically stop the car if the driver ignores the warning.
18. Why is a computer system installed in an experimental car?
19. What did the computer system do first when a problem arises?
20. What is special about the new computer system?