单项选择题

Of the various schemes that have been proposed to model how gene transcription might work in the living body, those involving actual physical contact between enhancers and genes remain -------, owing to an absence of direct evidence.

A． surreptitious
B． decipherable
C． vindicated
D． suspicious
E． speculative
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单项选择题
PRESIDENT: COUNTRY ::
A． choreographer: dance
B． speaker: parliament
C． actress: performance
D． instrumentalist: melody
E． poetess: thesaurus
单项选择题
Previous research has established the lupine wolf as the ------- of the modern canine, but when and where humans first domesticated the former into the latter remains unclear.
A． competitor
B． ally
C． scion
D． prey
E． progenitor
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