2017-08-12 226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)
想要获得更多咨询服务点击进入 >>>>有问题?找免费的澳际专家咨询! 或联系QQ客服: ,也可以通过在线咨询处留言,把您最关心的问题告诉我们。
Copyright 2000 - 2020 北京澳际教育咨询有限公司
www.aoji.cn All Rights Reserved | 京ICP证050284号
总部地址:北京市东城区 灯市口大街33号 国中商业大厦2-3层
高国强 向我咨询
行业年龄 11年
成功案例 2937人
留学关乎到一个家庭的期望以及一个学生的未来,作为一名留学规划导师,我一直坚信最基本且最重要的品质是认真负责的态度。基于对学生和家长认真负责的原则,结合丰富的申请经验,更有效地帮助学生清晰未来发展方向,顺利进入理想院校。
Tara 向我咨询
行业年龄 6年
成功案例 1602人
薛占秋 向我咨询
行业年龄 10年
成功案例 1869人
从业3年来成功协助数百同学拿到英、美、加、澳等各国学习签证,递签成功率90%以上,大大超过同业平均水平。
Cindy 向我咨询
行业年龄 18年
成功案例 4806人
精通各类升学,转学,墨尔本的公立私立初高中,小学,高中升大学的申请流程及入学要求。本科升学研究生,转如入其他学校等服务。