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
The great leaders of the second world war alliance, Franklin Roosevelt and Winston Churchill, understood the opposing forces of destruction and______; their war aims were not only to defeat fascism, but to create a world of shared______.
(A) grief… solutions
(B) construction … prosperity
(C) disaster… antipathy
(D) hope … domination
(E) salvation … proximity
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
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