单项选择题

"Alert to"( I st line ,4th paragraph)most probably means ______.

A．aware of
B．watchful for
C．responsible for
D．busy with
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单项选择题
The camp meeting ______ Catherine gave his first performance last summer was held for religious purpose.
A．where
B．which
C．that
D．who
单项选择题
Once you enter the society ,you are mostly ______ your own.
A．in
B．on
C．of
D．to
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