单项选择题

In the service of knowledge, scientists also train the most skilled component of the work force ______ to the employers.

A．in no cases
B．in a case
C．at no cost
D．at a cost
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单项选择题
Although we have badly fouled our planetary next, ______, it is by no means clear that our profligacy has as yet greatly changed the incidence of cancer.
A．with good will
B．at a rapid pace
C．with woeful consequences
D．at a special period
单项选择题
It is these skills that ______ are being neglected in the arguments over ambiguity and the setting of guidelines for sound research practices.
A．do I believe
B．I believe
C．I shall think
D．I will think
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