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
And yet here in front of our noses are deep-sea, carbon-based microbes ______ hellish, almost Venus-like conditions.
A．enabling to live in
B．enable us to live in
C．are able to live
D．able to live in
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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