单项选择题

Don't respond to any e-mails ______ personal information, no matter how official they look.

A. searching
B. asking
C. requesting
D. questioning
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单项选择题
You can see the stars on a clear night, but in the daytime they are ______.
A. unavoidable
B. invisible
C. inaccessible
D. unavailable
单项选择题
To overcome the difficulty they were faced with, several companies ______ to form a big one.
A. linked
B. united
C. joined
D. connected
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