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.（）

单项选择题Rose was one of the children who observe and______much, and now and then______their friends by a wise or confounding remark.（）

A、 prattle… amuse
B、 meditate… nonplus
C、 praise … displease
D、 meddle … surprise
E、 absorb… insult

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