单项选择题

Broad sanctions that ______ Indian and Pakistani scientists from the West are a counterproductive response to the two nations' unwelcome arrival in the nuclear club.

A．could isolate
B．may isolate
C．isolated
D．isolate
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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
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
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