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考研英语阅读冲刺模拟题及答案 ()
考研英语阅读冲刺模拟题及答案 ()
2020 2
2020 2
As Gilbert White Darwin and others obser ed long ago all species
As Gilbert White Darwin and others obser ed long ago all species
, , ,
, , ,
appear to ha e the innate capacity to increase their numbers from
appear to ha e the innate capacity to increase their numbers from
generation to generation. The task for ecologists is to untangle the
generation to generation. The task for ecologists is to untangle the
en ironmental and biological factors that hold this intrinsic capacity for
en ironmental and biological factors that hold this intrinsic capacity for
population growth in check over the long run. The great ariety of
population growth in check over the long run. The great ariety of
dynamic beha iors exhibited by different population makes this task
dynamic beha iors exhibited by different population makes this task
more difficult some populations remain roughly constant from year to
more difficult: some populations remain roughly constant from year to
:
year others exhibit regular cycles of abundance and scarcity still others
year others exhibit regular cycles of abundance and scarcity still others
ary wildly with outbreaks and crashes that are in some cases plainly
ary wildly with outbreaks and crashes that are in some cases plainly
,
,
correlated with the weather and in other cases not.
correlated with the weather and in other cases not.
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