单项选择题

INSTINCT:

A．hesitation
B．unachievablegoal
C．illogicalanxiety
D．acquiredresponse
E．illusion
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单项选择题
According to the passage, astronomers studying Martian meteors discovered on Earth were perplexed by them for which of the following reasons
A．ThemeteorsfoundonEarthweretooyoungtohaveoriginatedfromtheimpactsinquestion.
B．ThemeteorsfoundonEarthweretoooldtobeeasilydated.
C．NotenoughimpacteventshavebeenrecordedinrecenthistorytoexplainhowanyyoungmeteorswouldhavereachedtheEarth.
D．ImpactsonMarshavebeensosmallthatscientistsquestionhowanymeteorshavereachedtheearth.
E．TheagedistributionofmeteorsfoundonEarthwasinexplicablybasedtowardyouth.
单项选择题
OPAQUENESS:
A．thickness
B．lucidity
C．dormancy
D．shimmer
E．allurement
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