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请问XDF AND 逻辑无忧一个
12. One method of dating the emergence of species is to
compare the genetic material of related species.
Scientists theorize that the more genetically similar
two species are to each other, the more recently they
diverged from a common ancestor. After comparing
genetic material from giant pandas, red pandas,
raccoons, coatis, and all seven bear species, scientists
concluded that bears and raccoons diverged 30 to 50
million years ago. They further concluded that red
pandas separated from the ancestor of today's
raccoons
and coatis a few million years later some 10 million
years before giant pandas diverged from the other
bears
Which one of the following can be properly inferred
from the passage?
(A) Giant pandas and red pandas are more closely
related than scientists originally thought they were.
(B) Scientists now count the giant panda as the eighth
species of bear.
(C) It is possible to determine, within a margin of just a
few years, the timing of divergence of various
species
(D) Scientists have furred that giant pandas are more
similar genetically to bears than to raccoons.
(E) There is substantial consensus among scientists
that giant pandas and red pandas are equally related
to raccoons.
答案选D。能否解释一下此题及此类思路？ |
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发表于 2003-9-30 11:04:00
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