单项选择题

With a smirk, the（）historian takes it as a professional obligation to parade human nature always as an object of（）

A．puerile… dignity
B．sardonic … mockery
C．diligent … study
D．practiced … distrust
E． veteran … reproach

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单项选择题

Science and society are（）collaborators: In the best of worlds we may achieve a very fine and finely negotiated partnership, and in the worst of worlds,（）one by the other.

A．symbiotic … destruction of
B．antagonistic … amelioration of
C．trustworthy … exploitation of
D．uneasy … annihilation of
E．parasitic … indifference to

单项选择题

In view of the fact that his enemies knew him as cheerful, his allies exhorted him, as a matter of self-preservation, to（）himself as taciturn.

A．disguise
B．transform
C．admit
D．consider
E．recognize