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GRE阅读题目解析:不规则无球粒陨石

2016-12-22 09:57:00来源:网络

  P2

  1

  Shergottites, the name given to three anomalous achondrites (igneous meteorites lacking chondrules) so far discovered on Earth, present scientists with a genuine enigma.

  S 被用来命名三种迄今在地球发现的不规则无球粒陨石(不包含球粒的火成陨石),它可把科学家们难住了。

  2

  Shergottites crystallized from molten rock less than 1.1 billion years ago (some 3.5 billion years later than typical achondrites) and were presumably ejected into space when an object impacted on a body similar in chemical composition to Earth.

  S 由岩浆结晶而成,寿命短于 11 亿年(大约比典型的无球粒陨石晚形成 35 亿年),据推测当外来天体撞击一颗与地球化学成分类似的天体时,S 就会被抛向太空。

  3

  While some scientists speculate that shergottites derive from Io (a volcanically active moon of Jupiter), recent measurements suggest that since Io‘s surface is rich in sulfur and sodium, the chemical composition of its volcanic products would probably be unlike that of the shergottites.

  尽管一些科学家猜测 S 来自于 lo (一颗有火山活动的木星卫星),近期的观测结果表明,因为 lo 表面富含硫和纳,它的火山产物的化学成分很可能不同于 S。

  (注意 while 引导的让步,sine 引导因果关系时可替换为 because

  While some scientists speculate

  that shergottites derive from Io

  (a volcanically active moon of Jupiter),

  recent measurements suggest

  that

  since Io‘s surface is rich in sulfur and sodium,

  the chemical composition of its volcanic products

  would probably be unlike that of the shergottites. )

  4

  Moreover, any fragments dislodged from Io by interbody impact would be unlikely to escape the gravitational pull of Jupiter.

  而且,因外来天体撞击而抛出的碎片不太可能逃脱木星的引力。

  5

  The only other logical source of shergottites is Mars.

  其他的唯一合理的来源,就是火星。

  6

  Space-probe photographs indicate the existence of giant volcanoes on the Martian surface.

  星际探测器发回的照片表明火星表面存在巨大的火山。

  7

  From the small number of impact craters that appear on Martian lava flows, one can estimate that the planet was volcanically active as recently as a half-billion years ago — and may be active today. (178 words)

  根据火星火山岩浆流域上出现的少量撞击坑,我们可以推测,火星火山近期的活跃程度和 5 亿年前差不多 —— 也许延续到今天。

  3. The passage provides information to answer which of the following questions?

  (A) What is the precise age of the solar system?

  (B) How did shergottites get their name?

  (C) What are the chemical properties shared by shergottites and Martian soils?

  (D) How volcanically active is the planet Jupiter?

  (E) What is a major feature of the Martian surface?

  选E

  A 错在 solar system,没说太阳系的事。

  B 只说了被命名,没说命名的由来。

  C 一说 soils 就前功尽弃了。

  D 没说木星的火山活动,提到火山活动的是木星卫星和火星。

  E 正确项。有火山,major feature。

  For the following question, consider each of the choices separately and select all that apply

  4. It can be inferred from the passage that each of the following is a consideration in determining whether a particular planet is a possible source of shergottites that have been discovered on Earth

  A strength of the planet‘s field of gravity

  B proximity of the planet to its moons

  C chemical composition of the planet‘s surface

  选AC

  问我们以下因素那些能够决定地球 S 陨石的可能来源。

  A 正确。行星引力,因为这个因素,使科学家们判断,木星卫星抛出的碎片根本无法脱离木星引力场。

  B 模糊项。不能说完全错,因为本质上它和 A 相关,因为离得近,抛出了石头被母星俘虏,但这种说法禁不起推敲,如果母星小,引力弱,离得近也没用。

  C 正确项。化学成分不合,也帮助科学家排除了木星卫星的那种来源可能。

  以上就是新东方在线GER频道为你带来的GRE阅读题目解析:不规则无球粒陨石,更多精彩敬请关注新东方在线GRE频道。

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