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GRE阅读题目解析：美洲龙虾

2017-01-12 15:40:00来源：网络

　　【GRE阅读题目解析:针对女性的保护性法律】GRE考试考什么？GRE阅读是重点。新东方在线GRE频道为大家带来GRE阅读题目解析:美洲龙虾，答案见下一页，希望对大家GRE备考有所帮助。更多精彩尽请关注新东方在线GRE频道!

　　查看全部：GRE阅读答案解析(汇总)

　　GRE阅读题目解析:美洲龙虾

　　P4

　　The two claws of the mature American lobster are decidedly different from each other. The crusher claw is short and stout; the cutter claw is long and slender. This bilateral asymmetry begins to appear in the juvenile sixth stage of development. One possible explanation is that differential use of the claws determines their asymmetry; the claw that is used more becomes the crusher.

　　To test this hypothesis, researchers raised lobsters in the juvenile fourth and fifth stages of development in a laboratory environment in which the lobsters could manipulate oyster chips. Under these conditions, the lobsters developed asymmetric claws, half with crusher claws on the left, and half with crusher claws on the right. In contrast, when juvenile lobsters were reared in a smooth tank without the oyster chips, the majority developed two cutter claws. This unusual configuration of symmetrical cutter claws did not change when the lobsters were subsequently placed in a manipulatable environment or when they lost and regenerated one or both claws. (165 words)

　　7.The passage is primarily concerned with

　　(A) drawing an analogy between asymmetry in lobsters and handedness in humans

　　(B) developing a method for predicting whether crusher claws in lobsters will appear on the left or right side

　　(C) explaining differences between lobsters' crusher claws and cutter claws

　　(D) discussing a possible explanation for the way bilateral asymmetry is determined in lobsters

　　(E) summarizing the stages of development of the lobster

　　8.It can be inferred that of the two laboratory environments mentioned in the passage, the one with oyster chips was designed to

　　(A) prove that the presence of oyster chips was not necessary for the development of a crusher claw.

　　(B) prove that the relative length of time that the lobsters were exposed to the oyster-chip environment had little impact on the development of a crusher claw

　　(C) eliminate the environment as a possible influence in the development of a crusher claw

　　(D) control on which side the crusher claw develops

　　(E) simulate the conditions that lobsters encounter in their natural environment

　　9.Which of the following conditions does the passage suggest is a possible cause for the failure of a lobster to develop a crusher claw?

　　(A) The loss of a claw during the third or earlier stage of development

　　(B) The loss of a claw during the fourth or fifth stage of development

　　(C) The loss of a claw during the sixth stage of development

　　(D) Development in an environment devoid of material that can be manipulated

　　(E) Development in an environment that changes frequently throughout the stages of development

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