单项选择题

It is only in recent years that man found that the protection of our environment is no small matter to our lives.

A. 只有在近年人们才发现，保护环境对我们的生存至关紧要。
B. 只在前几年人类才发现，环境保护是我们生活中必不可少的。
C. 只有几年人们就会发现，环境保护不过是生活中的一件小事情。
D. 只需要几年人类就会发现，保护环境事情虽小，生活中却不易实现。
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What were they charged 400 dollars a dayThey were charged 400 dollars for a ______.
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As to all these warnings, who would be the target reader
A. Parents.
B. One’s child.
C. Teachers.
D. One’s relatives.
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