单项选择题

A. To probe into the cause of natural disasters.
B. To warn people of the enviromnental conditions.
C. To formulate effective plans to help the victims.
D. To study the influences of natural disasters.
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单项选择题
Which of the following is true about unemployment（）

A. It is caused by too much household borrowing.
B. It is felt more by the poor than by the rich.
C. It gets more seriously than expected.
D. It may be solved if people are optimistic.
填空题
(39) should be filled in（）
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