单项选择题

Today's scientists are no longer constrained simply by the laws of nature, ______ in the past, but also by the laws (and attitudes) of the land.

A．as generally the case
B．as was generally the case
C．as long ago
D．as expected
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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
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
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