题目内容

A．theB．aC．someD．much

A. the
B. a
C. some
D. much

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A．HoweverB．FurtherC．InsteadD．Still

A. However
B. Further
C. Instead
D. Still

We have long speculated that if there are other warm, wet and cozy planets like ours, they

A. harbor
B. labor
C. monitor
D. toil

Although we have badly fouled our planetary next, ______, it is by no means clear that our

A. with good will
B. at a rapid pace
C. with woeful consequences
D. at a special period

In the service of knowledge, scientists also train the most skilled component of the work

A. in no cases
B. in a case
C. at no cost
D. at a cost