单项选择题

Questions 22～25 are based on the following self introduction of a teacher. Why did the man give up studying physics

A．His eyesight was too poor.
B．Physics was too hard for him.
C．He had to work to support himself.
D．He didn’t like physics any more,
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单项选择题
How did the dog perform his duties
A．He was delighted to show them off.
B．He did his best but was not often successful.
C．He did them quickly to get them over.
D．He had few opportunities to do them.
单项选择题
It is necessary to know what sort of housing conditions people have in order to plan ______.
A．the sizes and ages of families
B．the sizes and ages of houses
C．how many presents will be needed
D．how many houses need to be built
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