单项选择题

It's been very cold the last few days. I think the winter's（） already.

A. set in
B. set off
C. set on
D. set out

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单项选择题
The poor countries are extremely （） to international economic fluctuations.

A. inclined
B. vulnerable
C. attracted
D. reduced
单项选择题
He is the only one that is senior in age （） her so she called him old pal.

A. over
B. against
C. to
D. above
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