一道prep07的语法题，看了语法笔记还是有不理解的地方

雪梦儿 · 发表于 2011-6-28 13:31:37

86. (29247-!-item-!-188;#058&003883)

An international team of astronomers working at telescopes in the Canary Islands and Spain has
detected at least 18 huge gas spheres estimated to have 5 to 15 times the mass of Jupiter, the
solar system's largest planet.

(A) astronomers working at telescopes in the Canary Islands and Spain has detected at least 18
huge gas spheres estimated to have 5 to 15 times the mass of Jupiter
(B) astronomers working at telescopes in the Canary Islands and Spain has detected at least 18
huge gas spheres estimated to be 5 to 15 times Jupiter's mass
(C) astronomers is working at telescopes in the Canary Islands and Spain, having detected at least
18 huge gas spheres that are estimated at 5 to 15 times the mass of Jupiter
(D) astronomers, working at telescopes in the Canary Islands and Spain, and has detected at least
18 huge gas spheres estimated at 5 to 15 times the mass of Jupiter
(E) astronomers, working at telescopes in the Canary Islands and Spain, has detected at least 18
huge gas spheres they have estimated to be 5 to 15 times Jupiter's mass

考点:   简洁有效（Rhetorical Construction）   平行对称（Parallelism）   比较（Comparison）
1)   不能随意更改原句的意思
2)   习惯用法: estimate at 后常用价格等数量词,除此以外的概念优先用 estimate to
3)   比较的双方一定要对应
4)   定语从句尽可能简化,常常省略that/which和be动词.   能直接用形容词修饰名词时，可以直接在名词
前/后跟形容词，比定语从句更简洁。如:the chemical that is irritating常表达为 the chemical irritant;
huge gas spheres that are estimated…常表达为huge gas spheres estimated…

(A)   正确,   句子结构简洁,   意思表达清晰且用词符合习惯
(B) the solar system's largest planet同位语结构无法修饰Jupiter's mass; 在gas spheres that are
estimated at 5 to 15 times the mass of Jupiter比较结构中,gas spheres和the mass of Jupiter不对应,
无法进行比较
(C)   更改了原句的意思working本来是修饰成分,用来修饰astronomers,在这里变成了句子的谓语,has

detected本来是原句的谓语动词,在该选项中做修饰成分,变成了附属结构; spheres that are estimated
at 5 to 15 times结构复杂,that are可以去掉; gas spheres和the mass of Jupiter不对应,无法进行比较
(D) and has detected没有能够与之平行的对象;   比较双方不对应
(E)   随意添加they改变了原句的意思,   原句并没有说一定就是astronomers进行了estimated; the
solar system's largest planet同位语结构无法修饰Jupiter's mass

句子结构: An international team… has detected …the mass of Jupiter, the solar system’s largest
planet.

关于B选项所说的，gas spheres和the mass of Jupiter不对应,
无法进行比较

其实我理解不了这里哪里有比较呢？而且B不能比较，A为什么可以比较呢？estimate at 和estimate to用法的不同的是？而且不是说estimate at+数量词吗？为什么这里又选了个estimate to 的呢？

牛牛们帮帮忙吧，谢谢了。。。

wildmantomba · 发表于 2012-2-22 16:25:16

虽然帖子很久了
说说自己的看法

这里指的应该是be动词的平衡，即be动词的两端是对等的
gas sphere（气层，气体的球体）不等于mass（体积、容积）

本贴相关题目 GMATPrep-2007E1-SC-86 (JJYY)

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