题目内容

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

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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

在Windows2000的资源管理器中按下()键不放单击文件图标，可同时选定多个连续的文件。

A. Shift
B. Ctrl
C. Alt
D. Tab

That community must now lead extensive reform. of the region's universities and scientific

A. entrench
B. entrench themselves
C. may entrench
D. may entrench themselves