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份GRE考试阅读预测机经,第三弹-智课教育旗下智课教育
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2015年8月份GRE考试阅读预测机经,第三弹-智课教育
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Biologists have long debated about whether egg production
in birds is biologically highly costly, some theorizing that egg
production is energetically or nutritionally demanding. Lack,
however, suggested that clutch size--the number of eggs a bird
lays per breeding cycle-- is far below the potential limit of egg
production. He suggested that clutch size had instead evolved in
relation to the number of young that the parents could
successfully rear. Subsequently, most studies focused on
limitations operating during chick rearing, particularly among
altricial species (species in which the parents feed their young in
the nest). Lack later recognized that in precocial species (species
in which young feed themselves), clutch size might be explained
by different factors -- the availability of food for egglaying
females, for example.
The passage suggests that biologists who say egg
production in birds is biologically highly costly would agree that
clutch size is determined primarily by
A. The nutritional and energy demands of egg production.
B. The number of young that the parents can rear
successfully.
C. Reproductive limitations operating during chick rearing.
D. The availability of food for newly hatched chicks.
E. The differences between altricial and precocial species.
参考答案:A. 参考第一句话。
Consider each of the choices separately and select all that
apply. The passage suggests that Lack would agree with which of
the following statements about factors affecting clutch size in
birds?
A. In altricial species, clutch size is determined primarily by
factors operating after eggs are laid.
B. In precocial species, c
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