单项选择题

The problems themselves are still not truly strategic because the operation of the global environment is not affected and the survival of civilization is not at stake.

A．at risk
B．at issue
C．pent up
D．adhere to
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单项选择题
Starting with the premise that there is life on the planet Mars, the scientist went on to develop his argument.
A．pretext
B．foundation
C．presumption
D．presentation
单项选择题
In the twentieth century new drugs have markedly improved health throughout the world.
A．recently
B．consistently
C．supposedly
D．noticeably
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