单项选择题

Few mathematicians are （） their futures on finding any such proof; instead, their efforts are focused on finding good, but not （）, solutions for most cases, a field of study aptly known as approximation theory.

A．betting … perfect
B．developing … convenient
C．pinning … substandard
D．destroying … exact
E． establishing … vague

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单项选择题
One encouraging sign in the problem of chaos among the soldiers' ranks was their vow, for what it was worth, to act in a more （） way.

A．concerted
B．ingenious
C．defiant
D．avid
E．diligent
单项选择题
CONSTRICT:（）

A．dilate
B．diverge
C．justify
D．expedite
E． extenuate
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