单项选择题

（） man can now create radioactive elements, there is nothing he can do to reduce their radioactivity.

A. As
B. Whether
C. While
D. Now that

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单项选择题
（） I sympathize, I can’t really do very much to help them out of the difficulties.

A. As long as
B. As
C. While
D. Even
单项选择题
（） with the size of the whole earth, the highest mountain does not seem high at all.

A. When compared
B. Compare
C. While comparing
D. Comparing
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