单项选择题


Questions 22 to 25 are based on the conversation you have just heard.

A．Because she can’t find someone to replace it.
B．Because she doesn’t have time to replace it.
C．Because she doesn’t want to pay for it.
D．Because no one knows how to replace it.
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单项选择题
A．Because he can’t find his office key.B．Because he has misplaced some exams.C．Because he’s unable to talk.D．Because he doesn’t like his classroom.
A．Because he can’t find his office key.
B．Because he has misplaced some exams.
C．Because he’s unable to talk.
D．Because he doesn’t like his classroom.
单项选择题
What is the new benefit of exercise found by those scientists（）

A．It can build muscles.
B．It can prevent heart disease.
C．It can keep people healthy.
D．It can improve brainpower.
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