单项选择题

Human choice, not the intrinsic content of science, determines the outcome—and scientists, as human beings, therefore have a special responsibility to provide council rooted in ______.

A．expiration
B．explanation
C．expertise
D．expenditure
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单项选择题
We have long speculated that if there are other warm, wet and cozy planets like ours, they might ______ carbon-based life like ours.
A．harbor
B．labor
C．monitor
D．toil
单项选择题
A firm ______ to eliminating restrictive state interference and bureaucracy wherever possible, and to introducing concrete measures aimed at creating a more competitive companies and their investors, is necessary for France's economic health.
A．enforcement
B．commitment
C．community
D．enterprise
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