单项选择题

In the last paragraph, the word "escalate" means ______.

A．decrease
B．go down
C．increase
D．decline
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单项选择题
It is expected that the world's population will reach ______ by the end of the century.
A．2 billion people
B．80 percent of all people
C．4.4 billion people
D．6.4 billion people
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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