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
It can be inferred from this passage that ______.
A．the rain is caused by water-vapor
B．the higher the air rises, the higher the temperature is
C．the higher the air rises, the lower the temperature is
D．the clouds rise, and the water drops become smaller
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.
B．Water.
C．Cloud.
D．Air.
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