单项选择题

We should be cautious in crossing a crowded street.

A. careful
B. intelligent
C. quiet
D. weary
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单项选择题
The President made a brief visit to Beijing.()

A. short
B. working
C. formal
D. secret
单项选择题
You have to make sure that you have chosen a secure solution.
A. clear
B. secret
C. advisable
D. safe
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