单项选择题

According to this passage, one way of preventing floods is ______.

A．to make the rain fall in the sea before it reaches the coast
B．to make the rain clouds
C．to cause monsoon in the sea
D．to bring heavy rain
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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
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.
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