GWD－31－20、21、22、23

calculous

BBDD

jyy10

问一个问题，第21题怎么会是b呢， 题目问in comparison with the hominid australopithecines, modern humans are :

B: less well adapted to walking upright 现代人怎么会比au这个时代的人不适应直立行走呢.

ynjiao

请问那里有GMAT21, 28，31套题呀?

我的邮箱地址是：stephengz{a} sina.com

请指教

谢谢！！！

jjll

以下是引用yuyingchao在2005-10-12 10:29:00的发言：

我想第23题还是C比较是文章的重心: 作者提出新的观点transition to a nuclear family对人类演化的影响, walk upright是演化的一环
C: argue that the transition to a nuclear family structure was a more crucial step in human evolution than was the development of stone tools

If the small-brained australopithecines were not toolmakers, what evolutionary advantage did they gain by walking upright? (Line 50) One theory is that bipedality evolved in conjunction with the nuclear family: monogamous parents cooperating to care for their offspring. Walking upright permitted the father to use his hands to gather food and carry it to his mate from a distance, allowing the mother to devote more time and energy to nurturing and protecting their children. According to this view, the transition to bipedal walking may have occurred as long as ten million years ago, at the time of the earliest hominids, making it a crucial initiating event in human evolution.

同意CBDA。23C讲的是最后一段的内容，是延伸性描述，或属于细节，不是文章的主旨。文中不光讲了bipedal locomotion和nuclear family的关系，还讲了和enlargement of the brain及development of stone tools的关系（第一和二段）。这些就是A中说的other key aspects of human evolution。A正确。

[此贴子已经被作者于2005-11-12 14:39:36编辑过]

zhanghuiyong

23题应该选D。

文章的第一段最后一句就是全文TS，D选项实际是TS的改写。

A选项为什么不对：第三段是延伸性内容，撇开不谈；全文1、2段实际上都是主要谈的是直立行走和脑容量变大之间的进化时序关系。作者对他们间的关系不是继承既成的观点的，不存在A中的解释问题。作者文中正好是想通过对化石的解剖结构来建立不同于原来观点(第一段首句)的新观点。简言之，作者不是解释什么既成观点，而是根据对化石的解剖结构的研究建立自己的新观点。

另外，A中的other key aspects of human evolution也没有根据。全文实际上就只谈了直立行走和脑容量扩大这两个进化之间的关系，其它的如骨盆、腿骨、肌肉什么之类的内容，实际都是为说明直立行走服务的。

luckystone2008

强烈支持23d. 文章是新老观点对比，后文都在列举证据反驳第一段的老观点。甚至还延伸到解释该现象。

从布局来看，逻辑是很清晰的。呵呵。

这套题最大的困惑就是2个语法题，但是居然没有讨论区，郁闷。。

scorp_w

CBDA

这篇错了两个，嗬嗬，前两个！因为作的快了，有点大意了！实在不该错阿！一定要更认真些！

只说23题！

b 比较直立行走和爬行的优缺点。不对！

c argue that the transition to a nuclear family structure was a more crucial step in human evolution than was the development of stone tools 原文中未给出比较！只是说making it a crucial initiating event in human evolution.
不对！

d。 analyze anatomical evidence（片面） of bipedal locomotion to show that the large brain of modern humans developed at a later stage of evolution than was previously believed 这个不是重点，重点在人类大脑变大是不是因为直立行走造成。

livary

21题：Lucy’s wide, shallow pelvis is actually better suited to bipedal walking than is the rounder, bowl-like pelvis of the modern human

因此为B: less well adapted to walking upright

livary

23题：A

D: analyze anatomical evidence of bipedal locomotion to show that the large brain of modern humans developed at a later stage of evolution than was previously believed。（the large brain 是文章的次要内容，不能作为主题；且modern humans有误）

to be discussed...

ericlai27

Reconstruction of the pelvis (hipbones) and femur (thighbone) of “Lucy”, a three-million-year-old skeleton that is the most complete fossilized skeleton from the australopithecine era, has shown that they are much more like the corresponding bones of the modern human than like those of the most closely related living primate, the quadrupedal chimpanzee.

22 选C