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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单项选择题
General acceptance of 3-D. films may prove hard to come by, as the experience of three decades ago indicated.
A．obtain
B．explain
C．understand
D．discern
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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