单项选择题

  Studies on cats have helped illuminate some of the abilities of our mysterious housemates.

A.lighten
B.obscure
C.explain
D.cherish
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单项选择题
It takes courage to ______ all the opposition to the decision to have these corrupt officials arrested.
A.break down
B.turn down
C.let down
D.shut down
单项选择题
World peace requires that the UN resolutions have to be carried out in a strict manner.
A.behavior
B.fashion
C.aspect
D.politeness
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