单项选择题

Questions 26 to 29 are based on the passage you have just heard.

A．Because they are beneficial insects.
B．Because they destroy insects without hurting us in any way.
C．Because they protect insect-eating animals.
D．Because they include some of the greatest enemies of the human race.
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单项选择题
A．Old people think of the young as a problem .B．Old people create this problem of age difference.C．Old people have a past; young people have a future.D．Old people and young people forget they are all human beings.
A．Old people think of the young as "a problem".
B．Old people create this "problem" of age difference.
C．Old people have a past; young people have a future.
D．Old people and young people forget they are all human beings.
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