单项选择题

SOUND: ECHO : :

A．sight: rainbow `
B．episode: television
C．light: reflection
D．affection: attachment
E．observation: microscope

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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

After the investigations and________that are both necessary and inevitable after a calamity such as the recently ended crisis, it may turn out that authorities could have handled the problem in a less________way.

A．observation ... convenient
B．analyses ... fashionable
C．second-guessing ... costly
D．footwork ... organized
E．solutions ... abstruse

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