单项选择题

Light levels are carefully controlled to fall within an acceptable level for ______ reading convenience.

A. intentional
B. ideal
C. obligatory
D. standard
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单项选择题
We’ll continue along the road ______ by our presidents more than seventy years ago.
A. given out
B. made out
C. wiped out
D. mapped out
单项选择题
Most nurses are women, but in the higher ranks of the medical profession women are in a______.
A. scarcity
B. minority
C. minimum
D. shortage
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