单项选择题

The ______ of the undertaking did not discourage the researchers.

A．intolerance
B．futility
C．proximity
D．reminiscence
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单项选择题
Mary could invite her friends to the house at her own ______ if she told her mother in time.
A．prudence
B．discretion
C．reaction
D．exertion
单项选择题
What he expected was ______ applause for his performance, not a polite spattering noise.
A．morose
B．prodigious
C．transient
D．spontaneous
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