Why do people constantly move from the countryside into the cities？
A. Because the earth in the countryside was polluted.
Because there are more jobs provided in the cities.
C. Because it is easier to make a living in the cities.
D. Because they are eager to get the benefits of modern cities.
Which of the following sentences is not true according to the author？
A. The author wants to tell us that pollution is a serious problem caused by man.
B. We can stop this trend of pollution merely by our own efforts.
C. Many scientists show their worry about the world pollution.
D. The pollution of the earth will threaten the human being"s survival.
Who caused this problem according to the passage？
A. The motor cycles.
B. The growing industries.
C. The human beings.
D. The larger cities.
If people want to reduce stress and depression, what attitude should they take according to some doctors？
A. They should take kind of positive attitude.
B. They should take the attitude of wait-and-see.
C. They should take the negative attitude.
D. They should follow their fate.
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