单项选择题

The third paragraph is concerned with ______.

A．how clouds rise in the air
B．how rain is formed
C．why water-vapor can float in the air
D．how clouds cause rain
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单项选择题
What does it of since water-vapor becomes water when it cools in Para. 3. refer to A) Water-vapor. C) Water. B) Cloud. D) Air.
A．What does "it" of "since water-vapor becomes water when it cools" in Para. 3. refer to
B．Water-vapor.
C．Cloud.
D．Water.
E．Air.
单项选择题
Which of the following statements is NOT TRUE
A．It is likely to cause all clouds to give up all their rain.
B．The frequency of rainfall could be cut down, and so could the amount of rainfall.
C．In Malaysia, the monsoon often results in floods.
D．If people found ways of reducing the amount of rainfall, there would be less flood damage.
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