单项选择题

The word "subject" in the passage means ______.

A．memory
B．the theme of listening material
C．a branch of knowledge studied
D．the student experimented on
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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
单项选择题
This passage is chiefly about ______.
A．smoking in forests
B．changing the attitudes and behavior of millions of people
C．the chief causes; of forest fires and their prevention
D．advances in knowledge of fire weather
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