单项选择题

Mr. Bridges mentioned briefly several other subjects in the course of his talk but mostly kept himself to the main topic.

A．touched off
B．touched down
C．touched on
D．touched up
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单项选择题
James is very set in his ways, but Mark has a more ______ attitude to life.
A．tolerant
B．flexible
C．cautious
D．defensive
单项选择题
Ted got a better job and left the school before Mrs. Wolcox had him expelled.
A．disgraced
B．degraded
C．executed
D．ejected
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