2017-08-12 265阅读
以下将为正在备战GMAT考试的同学们整理一些经典的GMAT阅读试题,并分多个合集推出,希望能够为正在备考GMAT考试的考生提供或多或少的帮助。
30. GWD-30-Q11-Q13 最老的火山岩石和发现它的科学意义
First identified in 1969, komatiites
are Earth’s oldest known volcanic
rocks and contain three times as much
Line magnesium as do most volcanic rocks.
(5) 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
(10) lava so that unusually high tempera-
tures would be required for the lava
to exist as a liquid.
Komatiites’ discovery was surpris-
ing in light of then-current geological
(15) 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
(20) over whether or not the very high tem-
peratures needed to produce magmas
rich in magnesium could have existed
on Earth. Hess suggested that the
presence of water, probably released
(25) 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
(30) high temperatures were indeed nec-
essary. By 1960, it was generally
accepted that volcanic rocks with such
high levels of magnesium could not
exist, and thus the discovery of koma-
(35) tiites 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.
以上就是本期GMAT试题的所有内容,考生可以此为据并进行针对性的练习,逐步掌握GMAT阅读的解题规律及技巧,以达到迅速提高GMAT考试成绩的目的。 相关链接:
1.GMAT考试资料:GWD试题合集(五十三)
2.GMAT考试资料:GWD试题合集(五十二)
3.GMAT考试资料:GWD试题合集(五十一)
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