微信:liulangji8899
  • 托福频道
    • 托福阅读
    • 托福听力
    • 托福写作
    • 托福口语
    • 托福真题
    • TPO
  • 雅思频道
    • 雅思阅读
    • 雅思写作
    • 剑桥雅思
    • 雅思听力
    • 雅思真题
    • 雅思口语
    • 雅思电子书
  • SAT频道
    • 2016SAT真题
    • 2017SAT真题
    • 2018SAT真题
    • 2019SAT真题
    • 2020SAT真题
    • 2021SAT真题
    • 2022SAT真题
  • AP频道
    • AP化学真题
    • AP统计学真题
    • AP生物真题
    • AP英语语言真题
    • AP心理学真题
    • AP物理真题
    • AP经济学真题
  • ACT真题
导航
TOEFL IELTS SAT真题 AP真题 ACT真题
托福资讯
  • 托福阅读
  • 托福听力
  • 托福写作
  • 托福口语
  • 托福真题
  • TPO
托福阅读 托福听力 托福写作 托福口语 托福真题 TPO +
当前位置: 首页 > 托福频道 > 托福阅读

2019年10月12日托福阅读真题+题目+答案:The Heavy Bombardment and Life on Earth

2022-06-27 来源:

2019年10月12日托福阅读真题+题目+答案:The Heavy Bombardment and Life on Earth

2019年10月12日托福阅读真题+题目+答案:The Heavy Bombardment and Life on Earth

It is estimated that Earth formed around 4.5 billion years ago, yet life-even the simplest sort of microscopic life that must have started things off_did not begin right away. Until about 3.9 billion years ago, Earth was subject to an intense barrage of large objects from space, a time called the "heavy bombardment." Radiometric dating of Moon rocks shows that most of the Moon's visible impact craters, or holes formed on its surface from impacts, must have formed during this early period of the solar system's history. This is not surprising: According to our modern theory of solar system formation, the planets were built as larger and larger chunks of rock (sometimes mixed with metal or ice). or planetesimals, collided with one another. When a colliding planetesimal stuck to a growing planet, the planet got larger, increasing its gravity and allowing it to draw in even more planetesimals. Even after the planets had reached essentially their current sizes, there must still have been many planetesimals floating around; some of them still remain today, as the objects we call asteroids and comets. Those planetesimals that had orbits intersecting the orbits of the planets were doomed to eventual collisions. and most of those collisions must have occurred early in the solar system's history, when the number of planetesimals was still large. In other words, the heavy bombardment was the period of time during which impacts were most common, and the evidence from the Moon tells us that this period ended by about 3.9 billion years ago.

1.The word "estimated" in the passage is closest in meaning to

O roughly calculated

O suggested

O assumed

O proven beyond doubt

 

2.Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information.

O There were many planetesimals left after the planets reached their current sizes, and the ones still remaining are called asteroids and comets

O The objects that we call asteroids and comets were floating around when the planets reached their current sizes

O Some of the planetesimals that remain today have reached essentially the same sizes as the planets that they are floating around

O The current sizes of the asteroids and comets that float around today are essentially the same as those of the earliest planetesimals

 

3.The discussion of radiometric dating in paragraph 1 suggests which of the following about the Moon?

O It may have once supported a very simple form of microscopic life

O It could not have formed the way that most other planets formed

O Its composition was originally similar to that of a comet.

O Most of its craters had been formed by about 3.9 billion years ago.

 

Some of the planetesimals were quite big. We have good reason to think that the Moon itself was created when a planetesimal the size of the planet Mars struck the young Earth within just 20 to 30 million years after Earth's formation. This "giant impact" is thought to have blasted rock from Earth's outer layers into space, where some of it settled into Earth's orbit and then was collected together by gravity to make the Moon.

 

4.According to paragraph 2. which of the following probably occurred within 20 to 30 million years of Earth's formation?

O Two planetesimals about the size of Mars collided to form the Moon.

O A planetesimal the size of Mars collided with the Moon.

O Rock blasted from Earth's outer layers collided with a planetesimal orbiting Earth.

O A major collision separated a significant amount of material from Earth, leading to the formation of the Moon.

.......余下托福阅读真题及题目答案省略!

2019年10月12日托福阅读真题+题目+答案:The Heavy Bombardment and Life on Earth,10元有偿下载完整版!

微信扫码支付

支付宝扫码支付

资料下载说明
  • 一般发网盘,邮箱,微信
  • 支付成功后,请加微信客服:liulangji8899
  • 微信客服一般都能及时回复
  • 文章关键词
  • 2019年10月12日托福阅读真题+题目+答案:The Heavy Bombardment and Life on Earth
  • 你可能感兴趣的文章
    • 托福阅读真题+题目+答案:Evolution in Peppered Moths
    • 托福阅读真题+题目+答案:The Development of Land Flora
    • 托福阅读真题+题目+答案:Dams and Flood Control
    • 托福阅读真题+题目+答案:Bumblebee Heat Regulation
    • 2021年6月22日托福阅读真题+题目+答案:The Early Cyclades 
    微信客服
    头条推荐
    • 2020年7月11日雅思小作文范文:The table below shows oil production in several African countries (barrels per day
    • 2020年7月11日雅思阅读真题+题目+答案:Stress of Workplace
    • 剑桥雅思真题15+答案解析PDF下载(高清无水印完整版)
    • 2013年1月5日雅思小作文题目:The charts give information about the reasons why people leave the UK and why peopl
    • 2014年托福阅读真题+题目+答案解析:The Beringia Landscape
    • 2014年托福阅读真题+答案解析+翻译:Agricultural Society in Eighteenth-Century British America

    托福资料

    托福听力真题 托福阅读真题 托福写作范文 托福口语范文 托福TPO 托福电子书

    雅思资料

    雅思阅读 雅思写作 剑桥雅思 雅思听力 雅思口语 雅思电子书

    SAT资料

    2016SAT真题 2017SAT真题 2018SAT真题 2019SAT真题 2020SAT真题 2021SAT真题 2022SAT真题

    AP资料

    AP化学真题 AP统计学真题 AP生物真题 AP英语语言真题 AP心理学真题 AP物理真题 AP经济学真题
    添加客服微信
    Email : foeveryoung18@outlook.com (I will reply you within 1-8 hours)
    皖ICP备2022007860号
    ©2020 socool00.com
    皖ICP备2022007860号
      热门资料
    • 托福真题
    • 雅思真题
    • SAT真题
    • AP真题
    添加客服微信
    • Email : foeveryoung18@outlook.com (I will reply you within 1-8 hours)
    • 皖ICP备2022007860号