单项选择题

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How old was the man when he became interested in collecting stamps（）

A．10.
B．9.
C．12.
D．8.

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单项选择题

A. 人们过去并未充分了解心灵的宁静对健康极为重要。
B. 如果人们能感觉到大脑的平静，那将对健康极为重要。
C. 人们过去对于心灵的宁静对健康的极端重要性并不了解。
D. 大脑的平静对健康极为重要，这一点人们尚未充分意识到。

单项选择题

A. would be raining
B. had been raining
C. would have been raining
D. had rained

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