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GRE阅读模拟练习题(239)

2017-05-19 09:35:00 来源:网络GRE资料下载

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  Astronomers have had difficulty accounting for certain planets discovered outside our solar system. They are called hot Jupiters because each is similar in mass to Jupiter, the largest solar-system planet, but orbits its parent star at a fraction of the distance at which Earth, let alone Jupiter, orbits the Sun. In the standard, solar-system-based theory of planetary formation,such a massive planet could not form so close to a star. So most attempts to explain a hot Jupiter’s existence envision it forming farther away, then migrating inward. According to one hypothesis, the planet’s gravitational field tugs on the proto-planetary disk of dust and gas from which it formed. The disk exerts its own gravitational tug, and this interplay of forces robs the planet of momentum in its orbital path, forcing it to spiral in toward the star. According to another hypothesis, the planet’s gravitational field is so strong that it creates a groove in the disk, partitioning it into inner and outer regions; the resulting gravitational interactions between the planet and these regions cause the planet to lose orbital momentum and spiral inward.Another question remains: what prevents the planet from continuing its spiral until it collides with the star?

  1. The author of the passage mentions “Earth” primarily in order to

  A:stress the massive size of a hot Jupiter

  B:emphasize the proximity of a hot Jupiter to its parent star

  C:imply that hot Jupiters are unlikely to harbor extraterrestrial life

  D:point out differences between Earth and Jupiter with regard to their orbital distance from the Sun

  E:illustrate how hot Jupiters might fit into the standard theory of planetary formation

  答案:B

  2. Which of the following elements is part of one but not both of the hypotheses discussed in the passage?

  A:An interplay of gravitational forces

  B:A loss of orbital momentum

  C:A protoplanetary disk composed of dust and gas

  D:A protoplanetary disk divided into two regions

  E:The movement direction of hot Jupiters

  答案:D

  3. It can be inferred from the passage that the “attempts” share which of the following goals?

  A:to explain how a Jupiter-sized planet could form so close to its parent star

  B:to explain what prevents a hot Jupiter from colliding with its parent star

  C:to determine whether a hot Jupiter is formed from a protoplanetary disk of dusk and gas

  D:to determine whether a hot Jupiter’s gravitational field is strong enough to create a groove in its protoplanetary disk

  E:to account for hot Jupiters in a way that is not inconsistent with the standard theory of planetary formation

  答案:E

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