【GMAT考满分阅读RC题库】First identified in 1969, komatiites are Earth's o_真题_答案

GWD - 阅读RC - 275

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First identified in 1969, komatiites are Earth's oldest known volcanic rocks and contain three times as much magnesium as do most volcanic rocks. This chemical composition suggests that komatiites formed from the hottest lava known ever to have erupted: a high concentration of magnesium changes the physical properties of lava so that unusually high temperatures would be required for the lava to exist as a liquid.

Komatiites' discovery was surprising in light of then-current geological theories about magmas, molten rock that forms in the Earth's mantle (the layer beneath the crust) and composes volcanic lava eruptions. Prior to 1960, geologists Bowen and Hess disagreed over whether or not the very high temperatures needed to produce magmas rich in magnesium could have existed on Earth. Hess suggested that the presence of water, probably released from minerals decomposing in the Earth's mantle, might have meant that a high-magnesium magma could have existed at a lower temperature. But Bowen showed experimentally that the high temperatures were indeed necessary. By 1960, it was generally accepted that volcanic rocks with such high levels of magnesium could not exist, and thus the discovery of komatiites changed geologists' assumptions about the characteristics of the Earth's mantle around the time of the formation of komatiites, between 2.5 and 4 billion years ago.

Which of the following most accurately describes the organization of the passage?

ATwo divergent views of a scientific phenomenon are reconciled.
BA phenomenon is described and its scientific significance is discussed.
CThe discovery of a scientific phenomenon is traced and its implications for further research are suggested.
DA long-standing scientific theory is examined and recently discovered evidence is shown to support it.
EThe ways in which a particular geological phenomenon is exceptional are detailed and classified.

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正确答案: B

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油闹

C的trace错了，没有trace dicovery这个过程，文章上来就直接宣告了discovery结果。

2016-08-22 15:10:39 IP属地：安徽举报

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danislj1227126

c选项further research没有

2016-05-27 03:55:53 IP属地：美国举报

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vicky525

The discovery of a scientific phenomenon is traced这里不对，trace的是观点的变化，而不是对这个现象的发现

2014-04-22 09:47:37 IP属地：局域网举报

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ivy要努力过生活

为什么不选E。。

2013-11-09 20:30:05 IP属地：局域网举报

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jzq1994

A: In the second paragraph of the passage, the author does mention two divergent views but doesn\'t reconcile them.
B:Correct.Because of the discovery, a generally-accepted belief has changed
C:Firstly the passage offers a discovery of rocks but not the discovery of a phenomenon.And more importantly,no further researches mentioned.
D:a long-standing belief has changed due to the discovery. Not to

2015-03-27 21:43:01 IP属地：局域网举报

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malen

C一看就不对啊，一段搬出主观点，二段写历史上两个矛盾点，最后结论是主观点成功胜出！ C选项说话方式完全和文章相反，文章是要说主观点好，不是说导致了主观点，如果选C那就是没有体会出作者意图了。

2016-11-30 19:51:35 IP属地：四川举报

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shakaga

文章结构：
第一段：介绍了Komatiites' discovery
第二段：
1-2：Komatiites' discovery对于当时关于岩浆的地质理论来说震惊；
2-2：然后介绍了1960年前，对于形成高镁含量的岩浆的高温是否存在的两种对立观点；
2-3：H的观点
2-4：B的观点
2-5：1960年，人们普遍接受了富含镁的火山岩是不可能的，从而Komatiites' discovery改变了地质学家对于2.5到4十亿年前地幔性质的假设

2018-10-30 16:27:58 IP属地：北京举报

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shakaga

A：reconcile不对，最后实际上支持了B的高温观点，反驳了H的低温观点。
B：正确
C：trace不对，文章开篇就将来Komatiites' discovery.
D：没有长期存在的科学理论，文章也没说Komatiites是近期发现，而且K的发现改变了地质学家关于2.5到4十亿年前地幔性质的假设
E：detail和classfy不对

2018-10-30 16:18:52 IP属地：北京举报

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SINBERCY

D 的 long-standing theory 不对

2014-10-21 20:46:54 IP属地：江西举报

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danislj1227126

and thus the discovery of komatiites changed geologists\' assumptions about the characteristics of the Earth\'s mantle around the time of the formation of komatiites, between 2.5 and 4 billion years ago.

体现了significance

2016-05-27 03:55:15 IP属地：美国举报

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正确率： 61%

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GWD

GWD
PREP07 Test 1
PREP07 Test 2
PREP2012
OG16
OG17
PREP08 Test 1
PREP08 Test 2
Manhattan
Magoosh
OG18
OG18-数学分册
OG18-语文分册
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OG19-语文分册
OG19-数学分册
OG20
OG20-语文分册
OG20-数学分册

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油闹

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vicky525

ivy要努力过生活

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malen

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SINBERCY

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