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
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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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They work long hours but do not earn enough to ensure a(n) ______ living for themselves and their families.
A. reticent
B. decent
C. innocent
D. descent
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