2. 外语
  3. Which of the following most logically completes the argument below? Alone among living species, human beings experience adolesce

Which of the following most logically completes the argument below? Alone among living species, human beings experience adolesce

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问题 Which of the following most logically completes the argument below? Alone among living species, human beings experience adolescence, a period of accelerated physical growth prior to full maturity. Whether other hominid species, which are now all extinct and are known only through the fossil record, went through adolescence cannot be known, since______.
选项 A、the minimum acceleration in physical growth that would indicate adolescence might differ according to species
B、the fossil record, though steadily expanding, will always remain incomplete
C、detecting the adolescent growth spurt requires measurements on the same individual at different ages
D、complete skeletons of extinct hominids are extremely rare
E、human beings might be the first species to benefit from the survival advantages, if any, conferred by adolescence
答案C
解析 本题是要找一个能够用来解释为什么无法知道其他已灭绝的只能从化石中研究的灵长目动物是否具有青春期的选项.(C)指出检查青春期迅速发育需要对同一个人的不同年龄阶段进行测量，而生物的化石只能提供不同生物在同一阶段或不同阶段的发育情况，所以(C)是正确答案；(A)易被误选，许多考生会根据各种生物经历青春期的最低的生长速度不同，推出无法知道它们是否经历青春期的结论，这种推理是错误的，因为虽然生物的种类不同，可以区别对待，但是还是可以验证几种生物是否经历青春期的；生物的化石不完全并不一定就无法知道其是否具有青春期，所以(B)也无法合理完成本文；(D)和(E)也都无法完成本题段落中的论述：
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