单项选择题

An excellent philatelist can detect a forged______with a single glance, for a true specimen bears markings and characteristics, without exception, that the______invariably lacks.（）

A、 painting… imitation
B、 insect… approximation
C、 coin… original
D、 stamp… facsimile
E、 treatise … falsehood

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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
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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