Among wide-ranging animal species, populations at the edge of the

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Among wide-ranging animal species, populations at the edge of the species’ range are frequently exposed to less (i)_____ and more variable conditions than those in other parts on the range. As a results, the animal’s abundance is often (ii)_____.

Blank(i)	Blank(ii)
A、erratic	D、lower at the periphery
B、favorable	E、unaffected by habitat
C、demanding	F、underestimated by researchers

答案：B,D

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