单项选择题

How do blind children play soccer

A．They listen to the sound of the ball bouncing.
B．They ask an adult to guide them.
C．They hold a bell in their hands.
D．They put a bell inside the ball.

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热门试题

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

单项选择题

What can be inferred about the defence mechanisms of the sea cucumber

A．They are very sensitive to surrounding stimuli.
B．They are almost useless.
C．They require group cooperation.
D．They are similar to those of most sea creatures.