单项选择题

A．Thank you.
B．Here you are.
C．Bus No. 2 right.
D．hat’s very kind of you.
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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.
A．You can answer it.
B．Yes, I lost my key.
C．No, I don’t think so.
D．I know the answer.
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
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