单项选择题

Why does Theresa think that Frank’s survey will influence his results（）

A. Because he didn’t do it according to the requirements of his teacher.
B. Because the respondents he interviewed are all students who represent student opinion rather than public one.
C. Because his questionnaires are too simple.
D. Because he got a very low rate of return.

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单项选择题
To get 36 credits, a postgraduate（）

A. can take courses alone
B. can write a thesis alone
C. should not only take courses but also write a thesis
D. should take three or four courses per term
单项选择题
Which is true of the attendant in the conversation（）

A．She is polite.
B．She is friendly.
C．She is indifferent.
D．She is too enthusiastic.
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