This usually leads to problems __17__ they are sent back into the wild.The average life span of Antarctic animals that are born in captivity is much __18__ than those in the wild.As a result, holding them in captivity can __19__ reduce their expected life span to the point that not enough of them mature to an age in which they are able to reproduce.Without a __20__ between the number of deaths and the number of births, a species will quickly become extinct.
1.A.all B.everything C.anything D.none
2.A.includes
B.obtains
C.contains
D.gains
3.A.in fact
B.even worse
C.what’s more
D.as a result
4.A.deals
B.mixes
C.copes
D.functions
5.A.changing
B.disturbing
C.raising
D.ruining
6.A.practically
B.possibly
C.absolutely
D.approximately
7.A.condition
B.nature
C.temperature
D.ecosystem
8.A.survive
B.adapt
C.apply
D.suit
9.A.attempt
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