单项选择题

What does the sentence "The bulging centres will increasingly become fertile fields for social unrest" mean

A．The crowded cities will likely become a place for people to work hard.
B．Many people will become farmers because they like the life there.
C．Residents of large cities will have more opportunities for a better life.
D．The crowded areas will have more problems.
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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 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
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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