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2017GRE填空模拟题:太阳更热更大的恒星

   2017-09-13   【

2017GRE填空模拟题:太阳更热更大的恒星

  Hotter and more massive than the Sun, stars called “stragglers” are puzzling to astronomers because such rapidly burning stars would not be expected to persist in ancient star clusters. Some researchers believe that the typical blue stragglers formed when two ancient, lower-mass stars collide and merge form more massive, hotter star. Peter Leonard theorizes alternatively that in low density globular clusters, where mergers between single stars occur too infrequently to account for the observed quantity of blue stragglers, these stragglers are created instead by a group of stars. He suggests that a pair of stars already orbiting each other presents a larger target for a third star or another pair. Once this new grouping forms, close encounters between the stars could prompt any two to merge as a blue straggler. Leonard’s model predicts that each blue straggler has a distant orbiting companion—as appears true of many blue stragglers in the M67 cluster of the Milky Way galaxy.

  1. The reference to a “larger target” serves primarily to suggest why a

  A. blue straggler would be more likely to collide and merge with another star than would be a lower-mass star

  B. pair of stars would be more likely to encounter other stars than would the typical blue straggler

  C. pair of stars would be more likely to interact with other stars than would a single star

  D. blue straggler would be more likely to interact with a pair of stars than it would with a third star

  E. third star would be more likely to encounter a pair than it would to encounter a blue straggler

  2. Information presented in the passage suggests which of the following about blue stragglers?

  A. They originate from stars that are hotter and more massive than the Sun.

  B. They are burning more rapidly than other types of stars observed in ancient star clusters.

  C. They are older than most other types of stars within the same star cluster.

  D. They are less numerous in low-density globular clusters than are pairs of stars.

  E. They generally originate from the oldest stars among those found in ancient star clusters.

  3. The passage cites which of the following as evidence undermining the theory presented in the second sentence?

  A. A discrepancy between the number of mergers between single stars in certain low-density globular clusters and that in other low-density globular clusters

  B. A discrepancy between the heat and mass of blue stragglers formed by one type of process and the heat and mass of blue stragglers formed by another type of process

  C. A discrepancy between the frequency of star mergers in low-density globular clusters and those in high-density globular clusters

  D. A discrepancy between the amount of heat and mass of ancient single stars and that of blue stragglers

  E. A discrepancy between the number of mergers between single stars in certain star clusters and the number of blue stragglers in those clusters

  1

  Hotter and more massive than the Sun, stars called “stragglers” are puzzling to astronomers because such rapidly burning stars would not be expected to persist in ancient star clusters.

  比太阳更热也更大的恒星,称为 “ straggler ”,它们令天文学家迷惑,因为燃烧得如此快速的恒星,不该一直存在于古老的星团中。

  (straggler 本义是掉队的人,落后的人,别人都走了他还呆在原地的人,中文语境基本把指恒星的 straggler 翻译成 超蓝巨星 。)

  2

  Some researchers believe that the typical blue stragglers formed when two ancient, lower-mass stars collide and merge form more massive, hotter star.

  一些研究者相信,典型的超蓝巨星,由两颗古老的,质量较低的恒星相撞结合而成,质量更大,更热。

  3

  Peter Leonard theorizes alternatively that in low density globular clusters, where mergers between single stars occur too infrequently to account for the observed quantity of blue stragglers, these stragglers are created instead by a group of stars.

  P L 提出另一种理论,即在低密度球状星团中,单独的恒星联合太罕见了,无法解释已经观测到的如此多的超蓝巨星,这些超蓝巨星是一群恒星产生的。

  4

  He suggests that a pair of stars already orbiting each other presents a larger target for a third star or another pair.

  他认为,一对已经互相吸引彼此环绕的恒星,对于第三颗恒星或另一对互绕的恒星,是更大的目标。

  5

  Once this new grouping forms, close encounters between the stars could prompt any two to merge as a blue straggler.

  一旦形成新的编组,恒星间的近距离接触,可能促使任何两颗恒星结合成一颗超蓝巨星。

  6

  Leonard’s model predicts that each blue straggler has a distant orbiting companion — as appears true of many blue stragglers in the M67 cluster of the Milky Way galaxy.

  L 的模型预测,每颗超蓝巨星都有一个远距离按轨道环绕的同伴 —— 银河系 M67 星团,似乎的确有很多这样的超蓝巨星。

  1. The reference to a “larger target” serves primarily to suggest why a

  A. blue straggler would be more likely to collide and merge with another star than would be a lower-mass star

  B. pair of stars would be more likely to encounter other stars than would the typical blue straggler

  C. pair of stars would be more likely to interact with other stars than would a single star

  D. blue straggler would be more likely to interact with a pair of stars than it would with a third star

  E. third star would be more likely to encounter a pair than it would to encounter a blue straggler

  选 C

  没啥讲的,看翻译。

  2. Information presented in the passage suggests which of the following about blue stragglers?

  A. They originate from stars that are hotter and more massive than the Sun.

  B. They are burning more rapidly than other types of stars observed in ancient star clusters.

  C. They are older than most other types of stars within the same star cluster.

  D. They are less numerous in low-density globular clusters than are pairs of stars.

  E. They generally originate from the oldest stars among those found in ancient star clusters.

  选 B

  根据句 1:

  Hotter and more massive than the Sun, stars called “stragglers” are puzzling to astronomers because such rapidly burning stars would not be expected to persist in ancient star clusters.

  同义转述。

  A 错。hotter and more massive 说的是 blue straggler 而不是形成 blue straggler 的恒星们。

  C 错。blue straggler 可能挺 old,看不出 older than most others 。

  D 开始乱比了。

  E 未知信息。

  3. The passage cites which of the following as evidence undermining the theory presented in the second sentence?

  A. A discrepancy between the number of mergers between single stars in certain low-density globular clusters and that in other low-density globular clusters

  B. A discrepancy between the heat and mass of blue stragglers formed by one type of process and the heat and mass of blue stragglers formed by another type of process

  C. A discrepancy between the frequency of star mergers in low-density globular clusters and those in high-density globular clusters

  D. A discrepancy between the amount of heat and mass of ancient single stars and that of blue stragglers

  E. A discrepancy between the number of mergers between single stars in certain star clusters and the number of blue stragglers in those clusters

  选 E

  先看句 2 提出了什么理论:

  Some researchers believe that the typical blue stragglers formed when two ancient, lower-mass stars collide and merge form more massive, hotter star.

  然后作者在句 3 中提到:

  Peter Leonard theorizes alternatively that in low density globular clusters, where mergers between single stars occur too infrequently to account for the observed quantity of blue stragglers, these stragglers are created instead by a group of stars.

  综合两句,选 E。

 

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