GMAT考试资料:GWD试题合集(四十七).

2017-08-12 作者: 226阅读

  以下将为正在备战GMAT考试的同学们整理一些经典的GMAT阅读试题,并分多个合集推出,希望能够为正在备考GMAT考试的考生提供或多或少的帮助。

  26. GWD-27-Q3-Q6 鸟为什么会飞的两种理论

  Two opposing scenarios,

  the “arboreal” hypothesis and

  the “cursorial” hypothesis, have

  Line traditionally been put forward con-

  (5) cerning the origins of bird flight.

  The “arboreal” hypothesis holds

  that bird ancestors began to fly

  by climbing frees and gliding

  down from branches with the

  (10) help of incipient feathers: the

  height of trees provides a good

  starting place for launching flight,

  especially through gliding. As

  feathers became larger over time,

  (15) flapping flight evolved and birds

  finally became fully air-borne.

  This hypothesis makes intuitive

  Sense, but certain aspects are

  Troubling. Archaeopteryx (the

  (20) earliest known bird) and its

  maniraptoran dinosaur cousins

  have no obviously arboreal

  adaptations, such as feet fully

  adapted for perching. Perhaps

  (25) some of them could climb trees,

  but no convincing analysis has

  demonstrated how Archaeopteryx

  would have both climbed and

  flown with its forelimbs, and there

  (30) were no plants taller than a few

  meters in the environments where

  Archaeopteryx fossils have been

  found. Even if the animals could

  climb trees, this ability is not

  (35) synonymous with gliding ability.

  (Many small animals, and even

  some goats and kangaroos,

  are capable of climbing trees

  but are not gliders.) Besides,

  (40) Archaeopteryx shows no obvi-

  ous features of gliders, such as

  a broad membrane connecting

  forelimbs and hind limbs.

  The “cursorial”(running)

  (45) hypothesis holds that small

  dinosaurs ran along the ground

  and stretched out their arms for

  balance as they leaped into the

  air after insect prey or, perhaps,

  (50) to avoid predators. Even rudi-

  mentary feathers on forelimbs

  could have expanded the arm’s

  surface area to enhance lift

  slightly. Larger feathers could

  (55) have increased lift incrementally,

  until sustained flight was gradu-

  ally achieved. Of course, a leap

  into the air does not provide the

  acceleration produced by drop-

  (60) ping out of a tree; an animal

  would have to run quite fast

  to take off. Still, some small

  terrestrial animals can achieve

  high speeds. The cursorial

  (65) hypothesis is strengthened by

  the fact that the immediate the-

  ropod dinosaur ancestors of

  birds were terrestrial, and they

  had the traits needed for high

  (70) lift off speeds: they were small,

  agile, lightly built, long-legged,

  and good runners. And because

  they were bipedal, their arms

  were free to evolve flapping flight,

  (75) which cannot be said for other

  reptiles of their time.

  以上就是本期GMAT试题的所有内容,考生可以此为据并进行针对性的练习,逐步掌握GMAT阅读的解题规律及技巧,以达到迅速提高GMAT考试成绩的目的。 相关链接

1.GMAT考试资料:GWD试题合集(四十六)

2.GMAT考试资料:GWD试题合集(四十五)

3.GMAT考试资料:GWD试题合集(四十四)

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