单项选择题

You never realize how fortunate you are to have good health until it is suddenly brought home to you by the sight of suffering.（）

A.除非你突然亲眼目睹体弱多病之苦，不然，你不会队识到你有一个健康的身体是何等幸运。
B.你永远不会意识到拥有健康是多么幸运，除非健康光临你家。
C.除非健康和苦难同时降临你家，否则，你不会幸运的。
D.你从来不知道拥有健康是多么幸运。直到有一天，疾病突然降临，你才如梦方醒。

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单项选择题

The word well-off (the last sentence of Para. 3) is close in meaning to（）.

A. poor
B. healthy
C. fast
D. rich

单项选择题

Which of the following is true according to the passage（）

A. Sections of economy do not influence each other.
B. In the expansion phase the business maintains development in the long run.
C. The end of the business in the prosperity period can be obviously seen.
D. Parts of economy are closely related to each other.