单项选择题

They work long hours but do not earn enough to ensure a（）living for themselves and their families.

A. reticent
B. decent
C. innocent
D. descended

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单项选择题
Thomas Edison considered genius to be（）one per cent inspiration and ninety-nine percent perspiration.

A. composed of
B. constituted in
C. consisted of
D. comprised in
单项选择题
（40）（）

A. chance
B. basis
C. purpose
D. opportunity
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