小站论坛_托福论坛

[小站机经与真题] 【17年6月17日GRE阅读机经】长阅读真题预测与参考答案:In 1995 the Galileo spacecraft captured data ...

412
14

Rank: 50Rank: 50Rank: 50Rank: 50Rank: 50Rank: 50Rank: 50Rank: 50

排名24

小站金币
26474
发表于 2017-6-12 17:24 | 小站社区iPhone客户端

扫一扫,你也能把小站论坛随身带着走

|显示全部楼层
6月17日GRE阅读逻辑预测机经
6月GRE一共有3场考试:(点击日期查看本场考试相关备战指导)

【机 经 导 读】
更新时间:
本场GRE机经预测分为长篇阅读、短篇阅读和逻辑阅读三大类,每题都提供正确答案思路解析

【精 彩 预 告】
本月共3场考试,6月17日考后会及时发布真题回忆,请持续关注!
In 1995 the Galileo spacecraft captured data about Jupiter's atmosphere--namely, the absence of most of the predicted atmospheric water--that challenged prevailing theories about Jupiter's structure. The unexpectedness of this finding fits a larger pattern in which theories about planetary composition and dynamics have failed to predict the realities discovered through space exploration. Instead of "normal planets" whose composition could be predicted by theory, the planets populating our solar system are unique individuals whose chemical and tectonic identities were created through numerous contingent events. One implication of this is that although the universe undoubtedly holds other planetary systems, the duplication of the sequence that produced our solar system and the development of life on Earth is highly unlikely.

Recently planetary scientists have suggested that the external preconditions for the development of Earth's biosphere probably included four paramount contingencies. First, a climate conducive to life on Earth depends upon the extraordinarily narrow orbital parameters that define a continuously habitable zone where water can exist in a liquid state. If Earth's orbit were only 5 percent smaller than it is, temperatures during the early stages of Earth's history would have been high enough to vaporize the oceans. If the Earth-Sun distance were as little as 1 percent larger, run away glaciations on Earth about 2 billion years ago would have caused the oceans to freeze and remain frozen to this day.


Second, Jupiter's enormous mass prevents most Sun-bound comets from penetrating the inner solar system. It has been estimated that without this shield, Earth would have experienced bombardment by comet-sized impactors a thousand times more frequently than has actually been recorded during geological time. Even if Earth's surface were not actually sterilized by this bombardment, it is unlikely that any but the most primitive life-forms could have survived. This suggests that only planetary systems containing both terrestrial planets like Earth and gas giants like Jupiter might be capable of sustaining complex life-forms.


Third, the gravitational shield of the giant outer planets, while highly efficient, must occasionally fail to protect Earth. Paradoxically, while the temperatures required for liquid water exist only in the inner solar system, the key building blocks of life, including water itself, occur primarily beyond the asteroid belt. Thus the evolution of life has depended on a frequency of cometary impacts sufficient to convey water, as well as carbon and nitrogen, from these distant regions of the solar system to Earth while stopping short of an impact magnitude that would destroy the atmosphere and oceans.


Finally, Earth's unique and massive satellite, the Moon, plays a crucial role in stabilizing the obliquity of Earth's rotational axis. This obliquity creates the terrestrial seasonality so important to the evolution and diversity of life. Mars, in contrast, has wildly oscillating tilt and chaotic seasonality, while Venus, rotating slowly backward, has virtually no seasonality at all.


1. The passage is primarily concerned with

A. Enumerating conditions that may have been necessary for a particular development
B. Outlining the conditions under which scientists may be able to predict certain events
C. Explaining how a particular finding affected scientists ' understanding of a phenomenon
D. Suggesting reasons why a particular outcome was more likely to occur than other possible outcomes
E. Assessing the relative significance of factors that contributed to a particular occurrence

2. It can be inferred from the passage that the "planetary scientists" would be most likely to agree with which of the following statements concerning the development of complex life forms on Earth?

A. It might have occurred earlier in Earth's history if cometary impacts had been less frequent than they were.
B. It could have occurred if Earth's orbit were 1 percent larger than it is but not if Earth's orbit were 5 percent smaller.
C. It probably follows a pattern common on other terrestrial planets that occupy planetary systems containing gas giants.
D. Its dependence on the effect that Jupiter's gravitational shield has on Earth was difficult to recognize prior to 1995.
E. It has been contingent on conditions elsewhere in Earth's solar system as well as on conditions on Earth itself.

3. The author of the passage most likely mentions Mars' "oscillating tilt" primarily in order to

A. Provide evidence for a proposition about the potential effects of cometary impacts
B. Emphasize the absence from our solar system of "normal planets"
C. Contrast the rotational axis of Mars with that of Venus
D. Characterize the role of other planets in the solar system in earth's development
E. Emphasize the importance of the Moon to the development of life on Earth

【思路指导】

游客,如果您要查看本帖隐藏内容请回复


偷偷告诉你>>来这里 可以一键下载本月机经完整内容哦~

相关帖子 | 楼主帖子

回复

使用道具 举报

在线课程,互动交流

Rank: 3

该用户从未签到

排名500+

小站金币
6
发表于 2017-6-13 01:37 |显示全部楼层
aaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaa
回复

使用道具 举报

Rank: 6Rank: 6

该用户从未签到

排名500+

小站金币
6
发表于 2017-6-13 04:23 |显示全部楼层
小站GREapp震撼发布
aAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
回复

使用道具 举报

Rank: 1

该用户从未签到

排名500+

小站金币
6
发表于 2017-6-13 14:52 |显示全部楼层
okkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk
回复

使用道具 举报

在线课程,互动交流

Rank: 1

该用户从未签到

排名500+

小站金币
10
发表于 2017-6-14 17:35 |显示全部楼层
好好啊肯德基啊奖励积分的连接方式独立风机
回复

使用道具 举报

Rank: 4Rank: 4

该用户从未签到

排名500+

小站金币
3
发表于 2017-6-16 08:49 |显示全部楼层
thxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
回复

使用道具 举报

Rank: 2Rank: 2

该用户从未签到

排名500+

小站金币
3
发表于 2017-6-16 14:28 |显示全部楼层
1111111111111111111111111111111111111111111111111111
回复

使用道具 举报

在线课程,互动交流

Rank: 1

该用户从未签到

排名500+

小站金币
10
发表于 2017-6-16 15:28 |显示全部楼层
1111111111111111111111111111111
回复

使用道具 举报

Rank: 3

该用户从未签到

排名500+

小站金币
10
发表于 2017-6-16 22:32 |显示全部楼层
Third, the gravitational shield of the giant outer planets, while highly efficient, must occasionally fail to protect Earth. Paradoxically, while the temperatures required for liquid water exist only in the inner solar system, the key building blocks of life, including water itself, occur primarily beyond the asteroid belt. Thus the evolution of life
回复

使用道具 举报

Rank: 3

该用户从未签到

排名500+

小站金币
0
发表于 2017-6-17 08:22 |显示全部楼层
alkjfdlkajfkldsjafklsdjfalk
回复

使用道具 举报

在线课程,互动交流
您需要登录后才可以回帖 登录 | 快速注册

领取福利

我们将以您绑定的 (****)
作为接收批改短信的默认手机号码

订阅小站最新精品课程信息

领取福利

输入您的手机号码,批改动态随时掌握!

订阅小站最新精品课程信息

您可以在设置—密码安全—绑定手机中随时修改您的手机号码

领取福利

还差最后一步了!只要填写完邮箱即可同时获得批改短信提醒小站精品课程信息两大福利了!

领取福利
快捷菜单

  Copyright 2009-2017 小站论坛,All Rights Reserved 小站教育  沪ICP备15003744号-3   网站地图   最新帖子 联系我们 | 站点统计 | 版权声明 | 免责及隐私声明

订阅最新机经

选择托福机经及考试日期进行预约,预约后机经将在考试前3-5天左右通过邮件和短信形式推送

热门机经*
考试日期*
立即订阅