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
The Space Age ______ in October 1957 when the first artificial satellite was launched by the Soviet Union.
A. initiated
B. originated
C. embarked
D. commenced
单项选择题
He never hesitates to make such criticisms ______ are considered helpful to other.
A. that
B. which
C. as
D. what
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