单项选择题

A．You can answer it.
B．Yes, I lost my key.
C．No, I don’t think so.
D．I know the answer.
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单项选择题
The scientists are interested in studying tree rings because they can tell ______ .
A．whether in that area the climate was favorable or not
B．whether people took good care of the trees or not
C．whether a particular tree was healthy or not
D．whether a particular tree were
单项选择题
American university students are usually under pressure because ______ .
A．their academic performance will affect their future affairs
B．they are heavily involved in student affairs
C．they have to observe university discipline
D．they want to run for positions of authority
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