单项选择题

A good title for this article would be ________.

A．Aspirin: the Most Popular Medicine in the World
B．Why I Take Aspirin
C．The Side Effects of Aspirin
D．How to Take Aspirin
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单项选择题
Which of the following is NOT true about the ultrasonic torch
A．It enables the blind to live a more normal life.
B．It is mainly used to scan the area in front of the operator for obstacles.
C．Fast succession of bleeps indicates that the obstacle is near.
D．Its sound can warn other people of the blind man’s approach.
单项选择题
The attempt to help blind people to see with sound ________.
A．was similar to the sound location system of the bats
B．led to a product that sent out sound waves of about 20,000 cycles per second
C．was experimented on a submarine
D．turned out to be a failure
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