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
What’s the conclusion that Charles Hillman got from his experiment
A．Exercise can keep students healthy.
B．Exercise can improve students’ brainpower.
C．Exercise can prevent students from disease.
D．Exercise can help students build muscles.
单项选择题
A．Teach Don’s class while he is absent.B．Give Professor Webster the key to Don’s office.C．Make an appointment with the doctor.D．Return some exams to the students.
A．Teach Don’s class while he is absent.
B．Give Professor Webster the key to Don’s office.
C．Make an appointment with the doctor.
D．Return some exams to the students.
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