Who caused this problem according to the passage？
A. The motor cycles.
B. The growing industries.
C. The human beings.
D. The larger cities.
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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.
Which of the following is not mentioned by the author as one of many causes of stress in the passage？
A. The boredom and frustration brought by unemployment.
B. The poorness of living space and housing shortage.
C. The stress and depression produced by sleeplessness.
D. The worry about financial and economic situation.
What will happen to a person if he suffers from long-term stress and depression？
A. He will lose his present job.
B. He will become bored with his life.
C. He will become sleepless and anxious.
D. He will commit suicide.
How many hours do people work a week at present according to the passage？
A. 10 hours.
B. 20 hours.
C. 30 hours.
D. 40 hours.
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