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Exercise 5,5
Spiders of many species change color to match
the pigmentation of the flowers they sit on. The
insects preyed on by those spiders, unlike human
beings, possess color discrimination so acute that
they can readily see the spiders despite the
seeming camouflage. Clearly, then, it must be in
evading their own predators that the spiders‘
color changes are useful to them.
5. Which of the following, if true, most strengthens
the argument?
(A) Among the animals that feed on color-
changing spiders are a few species of bat,
which find their prey through sound echoes.
(B) Certain animals that feed on color-changing
spiders do so only sparingly in order to keep
from ingesting harmful amounts of spider
venom.
(C) Color-changing spiders possess color
discrimination that is more acute than that of
spiders that lack the ability to change color.
(D) Color-changing spiders spin webs that are
readily seen by the predators of those spiders.
(E) The color discrimination of certain birds that
feed on color-changing spiders is no more
acute than that of human beings.
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发表于 2014-3-14 10:44:18
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