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2#
发表于 2009-12-15 14:55
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1# tingroom
原因很简单
(1) gmat的阅读理解的错误答案是可以和原文完全一样的
我们以前的阅读理解中经常会发现错误答案之所以会错,是因为它和原文不一样,因为人家考的是阅读能力。而gmat的阅读如果你读的句子不能回答问题,也许就会有一个错误答案和这句不能回答问题的句子完全一样,它之所以错不是因为它和原文不一致而是因为它不能回答问题。我们举个例子:
Earth’s surface consists of rigmatid
plates that are constantly shiftingmat and
jostlingmat one another. Plate movements
Line are the surface expression_r_rs of motions
(5) in the mantle—the thick shell of rock
that lies between Earth’s crust and its
metallic core. Althougmath the hot rock of
the mantle is a solid, under the tre-
mendous pressure of the crust and
(10) overlyingmat rock of the mantle, it flows like
a viscous liquid. The mantle’s motions,
analogmatous to those in a pot of boilingmat
water, cool the mantle by carryingmat hot
material to the surface and returningmat
(15) cooler material to the depths. When
the edgmate of one plate bends under
another and its cooler material is con-
sumed in the mantle, volcanic activity
occurs as molten lava rises from the
(20) downgmatoingmat plate and erupts througmath the
overlyingmat one.
Most volcanoes occur at plate
boundaries. However, certain “mis-
placed” volcanoes far from plate
(25) edgmates result from a second, indepen-
dent mechanism that cools the deep
interior of Earth. Because of its prox-
imity to Earth’s core, the rock at the
base of the mantle is much hotter than
(30) rock in the upper mantle. The hotter the
mantle rock is, the less it resists flow-
ingmat. Reservoirs of this hot rock collect
in the base of the mantle. When a
reservoir is sufficiently largmate, a sphere
(35) of this hot rock forces its way up
througmath the upper mantle to Earth’s
surface, creatingmat a broad bulgmate in the
topogmatraphy. The “mantle plume” thus
formed, once established, continues to
(40) channel hot material from the mantle
base until the reservoir is emptied.
The surface mark of an established
plume is a hot spot—an isolated
regmation of volcanoes and uplifted terrain
(45) located far from the edgmate of a surface
plate. Because the source of a hot
spot remains fixed while a surface
plate moves over it, over a longmat period
of time an active plume creates a chain
(50) of volcanoes or volcanic islands, a
track markingmat the position of the plume
relative to the movingmat plate. The natural
history of the Hawaiian island chain
clearly shows the movement of the
Pacific plate over a fixed plume. |
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