课程咨询

GRE首页 GRE课程 GRE动态 0元讲座 GRE模考网站

新东方在线 > GRE > GRE阅读 > 正文
扫码关注掌握一手留学资讯

扫码关注掌握一手留学资讯

回复XDF免费领

水平测试和备考资料

扫码关注公众号

GRE阅读题目解析:超新星引发造星运动

2017-03-27 08:52:00来源：新东方在线整理

　　P3

　　1

　　If a supernova (the explosion of a massive star) triggered star formation from dense clouds of gas and dust, and if the most massive star to be formed from the cloud evolved into a supernova and triggered a new round of star formation, and so on, then a chain of star-forming regions would result.

　　如果一个超新星(一颗巨大的恒星爆炸)在气体和尘埃组成的稠密星云中引发了造星运动，又如果新制造的最大的恒星发展成一颗超新星，进而引发了新一轮造星运动，以此类推，就会在一定区域内产生造星链式反应。

　　2

　　If many such chains were created in a differentially rotating galaxy, the distribution of stars would resemble the observed distribute in a spiral galaxy.

　　如果在一个差异螺旋星系中产生了许多这类链式反应，恒星的分布就会类似于我们在螺旋星系中观察到的景象。

　　3

　　This line of reasoning underlies an exciting new theory of spiral-galaxy structure.

　　根据上述逻辑，可以推出一套关于螺旋星系形成的新理论。

　　(underlie 位于 … 之下，构成 … 的基础，作为 … 的解释或说明)

　　4

　　A computer simulation based on this theory has reproduced the appearance of many spiral galaxies without assuming an underlying density wave, the hallmark of the most widely accepted theory of the large-scale structure of spiral galaxies.

　　一个基于此理论的电脑模拟实验，再现了许多螺旋星系的形成过程，没有预置密度波的假设，密度波是目前被广泛接受的大型螺旋星系结构形成理论的标志。

　　5

　　That theory maintains that a density wave of spiral form sweeps through the central plane of a galaxy, compressing clouds of gas and dust, which collapse into stars that form a spiral pattern. (160 words)

　　该理论认为，一道旋转的密度波扫过星系的中心平面，挤压气体和尘埃使之坍缩成一系列螺旋分布的恒星。

　　7. The primary purpose of the passage is to

　　(A) describe what results when a supernova triggers the creation of chains of star-forming regions

　　(B) propose a modification in the most widely accepted theory of spiral-galaxy structure

　　(C) compare and contrast the roles of clouds of gas and dust in two theories of spiral-galaxy structure

　　(D) describe a new theory of spiral-galaxy structure and contrast it with the most widely accepted theory

　　(E) describe a new theory of spiral-galaxy structure and discuss a reason why it is inferior to the most widely accepted theory

　　选 D

　　描述了一种新理论：超新星造星，造出的恒星的最大一颗又变成超新星，引发新一轮造星，最终造了一系列恒星，且呈螺旋排列。

　　并对比了现在主流的理论：旋转的密度波扫过星云，制造了一系列螺旋式排列的恒星。

　　8. The passage implies that, according to the new theory of spiral-galaxy structure, a spiral galaxy can be created by supernovas when the supernovas are

　　(A) producing an underlying density wave

　　(B) affected by a density wave of spiral form

　　(C) distributed in a spiral pattern

　　(D) located in the central plane of a galaxy

　　(E) located in a differentially rotating galaxy

　　选 E

　　见句 2 ：

　　“If many such chains were created in a differentially rotating galaxy, the distribution of stars would resemble the observed distribute in a spiral galaxy.”

　　9. Which of the following, if true, would most discredit the new theory as described in the passage?

　　(A)The exact mechanism by which a star becomes a supernova is not yet completely known and may even differ for different stars.

　　(B) Chains of star-forming regions like those postulated in the new theory have been observed in the vicinity of dense clouds of gas and dust.

　　(C) The most massive stars formed from supernova explosions are unlikely to evolve into supernovas.

　　(D) Computer simulations of supernovas provide a poor picture of what occurs just before a supernova explosion.

　　(E) A density wave cannot compress clouds of gas and dust to a density high enough to create a star.

　　选 C

　　新理论的逻辑链是：超新星 —》引发造星 —》最大造星变超新星 —》引发下一轮造星。

　　如果有证据表明，造出来的大恒星 不一定 变成超新星，逻辑链就断了，而这正符合 C 项描述。

　　以上就是新东方在线GER频道为你带来的GRE阅读题目解析:超新星引发造星运动，更多精彩敬请关注新东方在线GRE频道。

本文关键字: GRE阅读 GRE阅读真题

上一页 1 2 下一页

添加新东方美研助教回复【GRE】获取

模考真题|写作题库|阅读机经|佛脚词汇

更多资料

添加美研助教号，
回复【GRE】获取备考必看资料包

  • 1.打开手机微信【扫一扫】，识别上方二维码；
  • 2.点击【添加美研助教号】，回复对应关键字领取学习资料。
更多>>
更多内容

关注新东方美研助教

回复【GRE】获取备考必看资料包

新东方美研备考资料
GRE录播课（全科班/单项班） GMAT6-8人直播VIP小班 托福直播精讲班（30天/60天）
更多>>
更多惊喜>>

添加美研助教号，
回复【GRE】获取备考必看资料包

  • 1.打开手机微信【扫一扫】，识别上方二维码；
  • 2.点击【添加美研助教号】，回复对应关键字领取学习资料。
更多>>
更多资料
我要
反馈 返回
首页
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10