单项选择题

It will be emphasized that commercial space operations are inherently complex, longterm, capital-hungry, and set by a variety of risks.

A. beset by
B. inset by
C. preset by
D. reset by
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单项选择题
These data will be of considerable use for identifying and analyzing environmental degradation, and than crafting workable solutions（）.

A. /
B. from
C. with
D. to
单项选择题
A book put on the table overnight would（） the following morning.

A. not be found again
B. not be touched again
C. stay exactly where it was left
D. be provided to someone else
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