[請益] TPO11 Begging by Nestlings
看板TOEFL_iBT (TOEFL_iBT托福)作者chingting (有回憶的人最幸福)時間15年前 (2010/09/07 16:33)推噓0(0推 0噓 0→)留言0則, 0人參與討論串1/3 (看更多)
As these experiments show, begging apparently provides a signal of need that
parents use to make judgments about which offspring can benefit most from a
feeding. But the question arises, why don't nestlings beg loudly when they
aren't all that hungry? By doing so, they could possibly secure more food,
which should result in more rapid growth or larger size, either of which is
advantageous. The answer lies apparently not in the increased energy costs of
exaggerated begging—such energy costs are small relative to the potential
gain in calories— but rather in the damage that any successful cheater would
do to its siblings, which share genes with one another. An individual's
success in propagating his or her genes can be affected by more than just
his or her own personal reproductive success.
11. In paragraph 6, the author compares the energy costs of vigorous begging
with the potential gain in calories from such begging in order to
A) explain why begging for food vigorously can lead to faster growth and
increased size
B) By begging loudly for food it does not need, a nestling would
unnecessarily expose itself to danger from predators.
C) point out a weakness in a possible explanation for why nestlings do not
always beg vigorously
D) argue that the benefits of vigorous begging outweigh any possible
disadvantages
我自己選D 答案是C 可以問一下為什麼D錯嗎?謝謝!!
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