请教GWD30-Q11、 Q12:

dreamhope

GWD30-Q11 to Q13:

      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.

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Q11:

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

             

1. Two divergent views of a scientific phenomenon are reconciled.
2. A phenomenon is described and its scientific significance is discussed.
3. The discovery of a scientific phenomenon is traced and its implications for further research are suggested.
4. A long-standing scientific theory is examined and recently discovered evidence is shown to support it.
5. The ways in which a particular geological phenomenon is exceptional are detailed and classified.

答案选b，我选了c，请问从哪里看出c不对呢

 

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Q12:

Information in the passage suggests which of the following concerning the Earth’s mantle 2.5 to 4 billion years ago?

             

1. It contained magmas that were more significantly affected by the decomposition of minerals than are current-day magmas.
2. It contained a lower proportion of water that it contains today.
3. Its characteristics were accurately described by both Bowen and Hess.
4. Its temperature was sufficiently high to produce magmas with high magnesium content.
5. Its total magnesium content then was roughly equivalent to its magnesium content today.

答案选的d，我选了a，请问在那里定位是d呢

dreamhope

请大家帮帮忙

kathytc

同问11题

hsummer

implications for further research are suggested.11题这错了,并没有进一步的研究被suggest

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

就是说之前观点说不用高温,现在K的发现说明高温也可以.

flamedream

C 没有根据，没有说FURTHER RESEARCH

[此贴子已经被作者于2007-6-16 22:04:21编辑过]

ilovecushi

以下是引用flamedream在2007-6-16 22:03:00的发言：

C 没有根据，没有说FURTHER RESEARCH

    

不懂! 那文中的H 和 K的说法不算是further research 嘛?

sophiez2005

这道题没人解答吗？同问……，ps,12我选的是E……

mm007_mmgmat

12:

文中最后一句话说k的发现changed g's assumption，那么这个assumption是什么呢？我觉得应该是Prior to 1960,geologists Bowen and Hess disagreed over whether or not the very high tem-peratures needed to produce magmas

 rich in magnesium could have existed on Earth. ，那么题目的答案就是把这句话取反，即D

starbabe

不太对 是一个现象么？明明是一个发现啊~~~崩溃！
确实没有further  那两个科学家是讲1960以前的 是不是这样理解
文章用了个类似于倒叙的形式？对么？

[此贴子已经被作者于2009/9/17 18:49:52编辑过]

southnorth

可以理解成倒叙。

12题A错，因为decomposition of minerals 前提是低温，与发现相反。