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 C) 80 percent of all people
B) 4.4 billion people D) 6.4 billion people

A．It is expected that the world's population will reach ______ by the end of the century.
B．2 billion people
C．4.4 billion people
D．80 percent of all people
E．6.4 billion people

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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

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

It is expected that the world's population will reach ______ by the end of the century. A) 2 billion people C) 80 percent of all people B) 4.4 billion people D) 6.4 billion people

It is expected that the world's population will reach ______ by the end of the century.
A) 2 billion people C) 80 percent of all people
B) 4.4 billion people D) 6.4 billion people