单项选择题

Preventing smoker-caused forest fires is mainly a problem of ______.

A．building the proper knowledge and habits in human beings
B．safeguarding the forests from fire
C．posting roles in forests
D．holding the damage to minimum
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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
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
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