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A meteor stream is composed of dust particles that have been ejected from a parent comet at a variety of velocities. These particles follow the same orbit as the parent comet, but dueto their differing velocities they slowly gain on or fall behind the disintegrating comet until a shroud of dust surrounds the entire cometary orbit. Astronomers have hypothesized that ameteor stream should broaden with time as the dust particles’ individual orbits are perturbed by planetary gravitational fields. A recent computer-modeling experiment tested thishypothesis by tracking the influence of planetary gravitation over a projected 5,000-year period on the position of a group of hypothetical dust particles. In the model, the particleswere randomly distributed throughout a computer simulation of the orbit of an actual meteor stream, the Geminid. The researcher found, as expected, that the computer-model streambroadened with time. Conventional theories, however, predicted that the distribution of particles would be increasingly dense toward the center of a meteor stream. Surprisingly, thecomputer-model meteor stream gradually came to resemble a thick-walled, hollow pipe.

Whenever the Earth passes through a meteor stream, a meteor shower occurs. Moving at over 1,500,000 miles per day around its orbit, the Earth would take, on average, just over aday to cross the hollow, computer-model Geminid stream if the stream were 5,000 years old. Two brief periods of peak meteor activity during the shower would be observed, one as theEarth entered the thick-walled “pipe" and one as it exited. There is no reason why the Earth should always pass through the stream's exact center, so the time interval between the twobursts of activity would vary from one year to the next.

Has the predicted twin-peaked activity been observed for the actual yearly Geminid meteor shower? The Geminid data between 1970 and 1979 show just such a bifurcation, a secondaryburst of meteor activity being clearly visible at an average of 19 hours (1,200,000 miles) after the first burst. The time intervals between the bursts suggest the actual Geminid stream isabout 3,000 years old.

It can be inferred from the passage that which of the following would most probably be observed during the Earth's passage through a meteor stream if the conventional theories mentioned in the highlighted text were correct?

  • 分析A选项
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  • 分析B选项
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  • 分析C选项
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  • 分析D选项
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  • 分析E选项
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暂无雷哥网文字解析
当前版本由 哎呀 更新于2015-10-09 15:29:33 感谢由 哎呀 对此题目的解答所做出的贡献。
第一结构:A meteor stream is composed of dust particles that have been ejected from a parent comet at a variety of velocities.
(1)These particles follow...
(2)Astronomers have hypothesized...
(3)A recent computer-modeling experiment...
(4)In the model, the particles ...
(5)Conventional theories, however...
第2结构:Whenever the Earth passes through a meteor stream, a meteor shower occurs. (1)Moving at..
(2)Two...
(3)There is no reason why ...
第3结构:Has the predicted twin-peaked activity been observed for the actual yearly Geminid meteor shower?
(1)The Geminid data
(2)The time intervals between the bursts suggest the actual Geminid stream is about 3,000 years old.

(逻辑推理题,定位到第一结构第6层次+第2结构)
(A)   Meteor activity would gradually increase to a single, intense peak, and then gradually decline.(第2结构说当地球pass through 一个流星群,a meteor shower occurs.第一结构第2层次:distribution of particles would be increasingly dense toward the center of a meteor stream; 所以当地球穿过传统理论所说的中间particle密度最大的流星群,只会遇到一个逐渐增强,又减弱的流星雨)
(B)    Meteor activity would be steady throughout the period of the meteor shower.(与层次意思不符)
(C)    Meteor activity would rise to a peak at the beginning and at the end of the meteor shower.(与层次意思不符,应该是new theory的内容)
(D)    Random bursts of very high meteor activity would be interspersed with periods of very little activity. (层次未提及)
(E)     In years in which the Earth passed through only the outer areas of a meteor stream, meteor activity would be absent.(层次未提及)
当前版本由 nmbdy 更新于2017-10-31 11:41:37 感谢由 nmbdy 对此题目的解答所做出的贡献。

It can be inferred from the passage that which of the following would most probably be observed during the Earth's passage through a meteor stream if the conventional theories mentioned in the highlighted text were correct?
此问题涉及两个方面 1什么可以obser earth pass through MS 2con correct
所以定位需要顾及到此二者
第一个CON的理论出现在HIGHLIGHT后
第二个earth pass through(这里估计passage打错了 愿意是pass through)定位于第二段 关键找到什么observe 而且是无论新观点旧观点都是可以被看到的
所以结合这两点轻而易举就可以得出A正确
BC是新观点 DE直接层次定位错误

当前版本由 啦啦啦啦_zzy 更新于2020-10-15 19:56:03 感谢由 啦啦啦啦_zzy 对此题目的解答所做出的贡献。

conventional theory那句话的意思是传统的理论预测-partical的分布密度逐渐向中间增强,即中间最强外圈弱


题目讨论 10条评论)

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    不浪漫罪名

    穿过的过程,外圈-中间-外圈,中间最密集,所以先increase到peak,在decline
    文章看懂了,没想到还得脑补到这层意思
    0 0 回复 2020-09-03 09:58:42
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    superboy

    世间万物总有起有落!!!!!!!!我算是理解了!!!遁入空门!!!!!!有繁荣就有落魄!有高光就有暗淡!有胜利就有失败!有增长就有下降!!!!!!!!!!!!!!阿弥陀佛!!!
    4 0 回复 2019-05-08 18:34:06
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    施施stone

    这题如果看不懂文章根本没法做。。。
    0 0 回复 2018-12-27 12:45:57
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    Greeny

    看了一个小时 这篇文章到底在讲什么几把。。
    2 0 回复 2018-11-20 21:16:15
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    utada

    其实说的就是分布的特点
    0 0 回复 2018-06-05 19:57:51
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    Alex623

    Conventional theories, however, predicted that the distribution of particles would be increasingly dense toward the center of a meteor stream.越往中心越dense。
    
    条件: during the Earth's passage through a meteor stream if the conventional theories mentioned in the highlighted text were correct
    
    Meteor activity would gradually increase to a single, intense peak, and then gradually decline.
    meteor运动从外到中心,再到外边。dense先递增到极点再递减。
    C选项完全反了。
    0 0 回复 2018-04-16 13:34:26
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      默默回复Alex623

      一般往后看

      0 0 回复 2018-05-18 01:15:55

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    takarai

    这篇真跪了…好难
    0 0 回复 2017-12-23 19:22:50
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    nmbdy

    It can be inferred from the passage that which of the following would most probably be observed during the Earth's passage through a meteor stream if the conventional theories mentioned in the highlighted text were correct?
    此问题涉及两个方面 1什么可以obser earth pass through MS 2con correct
    所以定位需要顾及到此二者
    第一个CON的理论出现在HIGHLIGHT后
    第二个earth pass through(这里估计passage打错了 愿意是pass through)定位于第二段 关键找到什么observe 而且是无论新观点旧观点都是可以被看到的
    所以结合这两点轻而易举就可以得出A正确
    BC是新观点 DE直接层次定位错误
    0 0 回复 2017-10-31 11:41:31
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    Ashinxgy

    1st:提出新观点,流星群是随着时间逐渐扩大的(有一个比较考点,the same orbit,也许会问什么和什么一样,也许会问原因...),证明观点正确---实验;反驳老观点,老观点觉得是往中心聚集的
    2nd:地球穿梭流星群所需时间反映流星群年龄,会有两次流星活动高峰
    3rd:事实证明也确实存在着这两次高峰,从观测Geminid的数据可以看出
    0 0 回复 2017-10-28 10:22:34
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    空杯心澄

    怎么可以看出A选项的and then gradually decline?
    0 0 回复 2016-05-04 06:53:37
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      小可爱啊回复空杯心澄

      形成一个高密度的中心,周围的密度是逐渐减小的,换成地球穿过时的流星雨就变成了先增多后减少。

      0 0 回复 2017-08-22 10:52:54

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    • 题目来源1:破解版12

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