单项选择题

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

A. reticent
B. decent
C. innocent
D. descent
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单项选择题
Thomas Edison considered genius to be ______ one percent inspiration and ninety-nine percent perspiration.
A. composed of
B. constituted in
C. consisted of
D. comprised in
单项选择题
When a number of people ______ together in a conversational knot, each individual expresses his position in the group by where he stands.
A. pad
B. pack
C. squeeze
D. cluster
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