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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单项选择题

The returning echoes the receiver picks up are ________.

A．clearly audible bleeps
B．inaudible to human ears
C．immediately passed on to headphones
D．filtered through the transmitter

单项选择题

What is the usage of the Pony Express

A．To help people travel from coast to coast.
B．To train ridem for competition.
C．To transfer materials and messages.
D．To arrest criminals in the West.