单项选择题

Passage One Questions 26 to 28 are based on the passage you have just heard.

A．They work by motion.
B．They work by electricity.
C．They work by rubbing the food.
D．They work by sending short waves.
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单项选择题
A．A sand beach.B．A deep valley.C．A high mountain.D．A grain of sand.
A．A sand beach.
B．A deep valley.
C．A high mountain.
D．A grain of sand.
单项选择题
A．He looks after them carefully.B．He does not like Mr. Smith and his friends.C．He is very strict.D．He makes them work even in the early morning.
A．He looks after them carefully.
B．He does not like Mr. Smith and his friends.
C．He is very strict.
D．He makes them work even in the early morning.
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