单项选择题

Physics is the present-day equivalent of ______ used to be called natural philosophy, from which most of present-day science arose.

A. that
B. ail
C. which
D. what
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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
From the tears in Nedra's eyes we can deduce that something sad ______.
A. must have occurred
B. would have occurred
C. might be occurring
D. should occur
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