NO8.1 短阅读

ecustdreamerUID: 3396543

Geologists have long known that the Earth’s mantle is heterogeneous, but its spatial arrangement remains unresolved—is the mantle essentially layered or irregularly heterogeneous? The best evidence for the layered mantle thesis is the well-established fact that volcanic rocks found on oceanic islands, islands believed to result from mantle plumes arising from the lower mantle, are composed of material fundamentally different from that of the midocean ridge system, whose source, most geologists contend, is the upper mantle.
Some geologists, however, on the basis of observations concerning mantle xenoliths, argue that the mantle is not layered, but that heterogeneity is created by fluids rich in “incompatible elements” (elements tending toward liquid rather than solid state) percolating upward and transforming portions of the upper mantle irregularly, according to the vagaries of the fluids’ pathways. We believe, perhaps unimaginatively, that this debate can be resolved through further study, and that the underexplored midocean ridge system is the key.
17.        Which of the following best expresses the main idea of the passage?
(A) Current theories regarding the structure of the Earth’s mantle cannot account for new discoveries regarding the composition of mantle xenoliths.
(B) There are conflicting hypotheses about the heterogeneity of the Earth’s mantle because few mantle elements have been thoroughly studied.
(C) Further research is needed to resolve the debate among geologists over the composition of the midocean ridge system.
(D) There is clear-cut disagreement within the geological community over the structure of the Earth’s mantle.
(E) There has recently been a strong and exciting challenge to geologists’ long-standing belief in the heterogeneity of the Earth’s mantle.
为什么选D，B错在哪里，，few的界定范围是什么？
求大神解释一下


以及20题
The authors suggest that their proposal for determining the nature of the mantle’s heterogeneity might be considered by many to be
答案A，选了B
(A) pedestrian
(B) controversial
(C) unrealistic
(D) novel
(E) paradoxical
什么情况选pedestrian，是不是通篇没出现作者态度？

crazyrobinUID: 2368627

Few 0-49 不超过一半
B不错在few B because 强调了原因，是因为 few study 导致出现conflicting opinion
但是原文没提及出现这种分歧观点的原因是什么

crazyrobinUID: 2368627

第一句和最后一句， long known; we believe, perhaps unimaginatively
这题问的不是作者态度，问的是many的态度

ecustdreamerUID: 3396543

crazyrobin 发表于 2013-2-3 10:16
第一句和最后一句， long known; we believe, perhaps unimaginatively
这题问的不是作者态度，问的是many ...

soga，got it ，thx robin
看来不是题没读细就是文章，真要多练