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
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

单项选择题
Lightning-caused fires can be controlled quickly by()

A.holding the fire damages to a minimum
B.people who have changed their attitude and behavior
C.enough rue fighters with good fire-fighting devices
D.carrying out experiments in "seeding" thunder clouds

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