GRE阅读练习每日一篇(三十五)_GRE阅读

　　21. According to the passage, starry flounder differ from most other species of flatfish in that starry flounder

　　are not basically bilaterally symmetric

　　do not become asymmetric until adulthood

　　do not all share the same asymmetry

　　have both eyes on the same side of the head

　　tend to cluster in only certain geographic regions

　　22. The author would be most likely to agree with which of the following statements about left-eyedness and right-eyedness in the starry flounder?

　　I. They are adaptive variations by the starry flounder to environmental differences.

　　II. They do not seem to give obvious selective advantages to the starry flounder.

　　III. They occur in different proportions in different locations.

　　I only

　　II only

　　I and III only

　　II and III only

　　I, II, and III

　　23. According to the passage, a possible disadvantage associated with eye migration in flatfish is that the optic nerves can

　　adhere to one another

　　detach from the eyes

　　cross

　　stretch

　　twist

　　24. Which of the following best describes the organization of the passage as a whole?

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