单项选择题

In the second paragraph, the author talks about______.

A．conclusions reached by the U.N. study
B．Rafael M. Salas's personal opinions about the future
C．the rate of population growth
D．a flood of migration from rural areas
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单项选择题
The third paragraph implies that ______.
A．people should be encouraged to live in the urban centers
B．government should encourage people to live in the rural areas
C．people have more advantages in the countryside
D．living in the countryside is better than in the big cities
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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