雷哥网GMAT-【OG20-P799-834题】Some anthropologists believe that the genetic homo_OG16

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【OG20-P799-834题】

Some anthropologists believe that the genetic homogeneity evident in the world’s people is the result of a “population bottleneck”—at some time in the past our ancestors suffered an event, greatly reducing their numbers and thus our genetic variation.

A

at some time in the past our ancestors suffered an event, greatly reducing their numbers
分析A选项
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B

that at some time in the past our ancestors suffered an event that greatly reduced their numbers
分析B选项
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C

that some time in the past our ancestors suffered an event so that their numbers were greatly reduced,
分析C选项
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D

some time in the past our ancestors suffered an event from which their numbers were greatly reduced
分析D选项
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E

some time in the past, that our ancestors suffered an event so as to reduce their numbers greatly,
分析E选项
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题目讨论（10条评论）

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麻辣小荔枝

CD 比较好排除，主要是 numbers 和 variation 的平行就可以了，E 选项句子结构明显混乱也可以不用考虑，主要在于 A 和 B，对于这两个选项私以为，第一，波折号后边必然可以加句子，和分号作用相同。但是也可以不加，接名词性从句等修饰成分做解释说明，如本题。第二，B 选项的 that 从句不是和前面的从句平行，而是作为 event 的同位语，解释了bottleneck。第三，A和 B 的差别在于reduing 修饰了 suffer 还是 event 本身，从语义上讲，应该是 even 的本身减少了numbers 而不是 suffer 这件事请导致的结果

0 0 回复 2022-01-12 18:57:03
465414xzt

神nm破折号不能连接两个完整的句子，hp

0 0 回复 2022-01-06 14:52:25
唐多令

定从强调具体时间、具体动作以及动作一致性；分词强调不确定时间、抽象客观以及多次的行为。

0 0 回复 2021-12-22 19:22:09
216505pr

破折号不能连接两个完整句子，加了that以后，破折号后的句子成为前一个句子的同位语，起到解释说明的作用。所以AD都可以排除；C，and thus our genetic variation没有可以平行的东西，排除；E，同C；选B

0 0 回复 2021-11-26 14:28:09
向北歌

Some anthropologists believe that the genetic homogeneity evident in the world’s people is the result of a “population bottleneck”—that at some time in the past our ancestors suffered an event that greatly reduced their numbers and thus our genetic variation.

0 0 回复 2021-11-07 23:27:26
冲他丫的

题目Some anthropologists believe that the genetic homogeneity evident in the world’s people is the result of a “population bottleneck”—at some time in the past our ancestors suffered an event, greatly reducing their numbers and thus our genetic variation.

0 0 回复 2021-10-26 21:36:22
冲他丫的回复冲他丫的

A：svo,doing doing修饰v 不合逻辑 C：So that不能构成结果状语，导致thus后面没有谓语 D：sb suffered an event from sth and thus sth导致thus后面没有谓语 E:逗号后面不接that引导的非限定从。

0 0 回复 2021-10-26 21:43:58

吃着香蕉开跑车

选B

注意句子主干是anthropologists believe that... that ...，其中分号后面造成reducing的是一件事件，不是祖先去减少人数。

A：suffered和reduced不平行，是谁reducing也没有说清楚，主语anthropologists believe that，后面没有解释好相信的是啥。项的分词从句出现在这么靠后的地方，到底是定语从句——修饰the event, 即 the event reduced their numbers呢？还是状语从句修饰主句主谓——修饰our ancestors suffered, 即 (when) our ancestors reduced their(ancestors') numbers, our ancestors suffered an event. 这叫状语从句省略修辞，省略引导词和相同主语，因此reducing的发起者默认是ancestors。不读句意，也可以确定A选项存在修饰级别错误的嫌疑。不优选

C：and前面的逗号和后面你句子意思无法并列。So that不能构成结果状语，导致thus后面没有谓语

D：还原their numbers were greatly reduced from an event，导致thus后面没有谓语

E:逗号后面不接that引导的非限定从。

0 回复 2021-05-08 15:28:23

少冰冷萃

dash后面的同位语解释说明一定要保持平行吗？

0 0 回复 2021-04-23 15:31:41
254879lkz

可以通过语意来判断 A祖先减少他们的数量，语意奇怪，应该是某件事减少了祖先的数量 C so that 表目的，遭受大事是为了减少数量错 D从事数量减少，应该是因为那件事数量减少，from which 没有体现因果关系 E同c

3 0 回复 2021-02-04 03:03:42
981978cndam

A里面变成祖先reduce their numbers，错误 When we have an independent clause followed by a participle phrase (one that starts with a gerund and serves as an adjective clause), the participle phrase modifies the subject of the sentence.

1 0 回复 2020-08-03 15:07:22