OG16 90与104对比

锕儍

90. Prices at the producer level are only 1.3 percent higher now than a year ago and are going down, even though floods in the Midwest and drought in the south are hurting crops and therefore raised corn and soybean prices.

A: than a year ago and are going down, even though floods in the Midwest and drought in the south are hurting crops and therefore raised
B: than those of a year ago, and are going down, even though floods in the Midwest and drought in the south are hurting crops and therefore raising
C: than a year ago and are going down, despite floods in the Midwest and drought in the south, and are hurting crops and therefore raising
D: as those of a year ago and are going down, even though floods in the Midwest and drought in the south hurt crops and therefore raise
E: as they were a year ago and are going down, despite floods in the Midwest and drought in the south, and are hurting crops and therefore raising        


104.Heating-oil prices are expected to be higher this year than last because refiners are paying about $5 a barrel more for crude oil than they were last year.

(A) Heating-oil prices are expected to be higher this year than last because refiners are paying about $5 a barrel more for crude oil than they were

(B) Heating-oil prices are expected to rise higher this year over last because refiners pay about $5 a barrel for crude oil more than they did

(C) Expectations are for heating-oil prices to be higher this year than last year’s because refiners are paying about $5 a barrel for crude oil more than they did

(D) It is the expectation that heating-oil prices will be higher for this year over last because refiners are paying about $5 a barrel more for crude oil now than what they were

(E) It is expected that heating-oil prices will rise higher this year than last year’s because refiners pay about $5 a barrel for crude oil more than they did

以上是OG中两道题，90题答案是B，答案给的解释是A选项price are higher now than a year ago把price价格和时间进行比较，所以是错的，然而104题正确答案是A把价格和时间作比较而且排除了than last year's的选项，不太明白期间有什么区别。

另外看过一个104题的解释是，than last后面省略了they were，后面关于crude oil价格对比中则不省略they were，请问是省略与不省略都对还是有其他需要关注的点？

都是困扰了很久的问题，欢迎大家讨论。

锕儍

531.New techniques in thermal-scanning photography, a process that records radiation from surface areas,    makes it possible to study the effects of calefaction, or warming, of a river in greater detail than ever before.
(A)    makes    it    possible    to    study    the    effects    of    calefaction,    or    warming,    of    a    river    in    greater    detail    than    ever    before
(B)    make    it    possible    to    study,    in    greater    detail,    the    effects    of    calefaction,    or    warming,    of    a    river    than    ever    before
(C)    have    made    it    possible    to    study    in    greater    detail    than    ever    before    the    effects    of    calefaction,    or    warming,    of    a    river
(D)    make    possible    the    study    of    the    effects    of    calefaction,    or    warming,    of    a    river    in    greater    detail    than    it    ever    was    before
(E)    has    made    it    more    possible    than    ever    before    to    study    in    greater    detail    the    effects    of    calefaction,    or    warming,    of    a    river

Ans：C


还有这道题，more...than ever before的结构不存在把detail与before对比的问题吗？为什么不是than that of ever before？

yj79434175

楼主，RON神的这篇帖子可以完美的解决你的问题。
http://www.manhattanprep.com/gmat/forums/post108547.html?hilit=omission&sid=690f50b602b417b61a4cef36a0d8d0b6#p108547

锕儍

yj79434175 发表于 2016-9-2 09:13
楼主，RON神的这篇帖子可以完美的解决你的问题。
http://www.manhattanprep.com/gmat/forums/post108547.ht ...

你好，我看了这些帖子，觉得对比较题型中的parallel有更深的理解了，然而还是没有太明白第二题和第三题为什么可以直接对比时间。Namely，this year than last（第二题）与now than a year ago（第一题）在语法上有什么区别？
或者还是像Ron在帖子里说的，关注别的点排除，这一点就不在纠结了？

锕儍

今天再回顾这三道题，终于好像想出了一种解释，不知道对不对。
就是last year与last/before的区别。
last year中包含名词，所以存在着price与时间相比的歧义，然而后两道题则不存在这样的问题，所以不必加上前句的主语，是这样的吗？

别贝尔

RON认为这个比较now than a year ago 是可以的，这个选项需要通过其他错误来排除

RON链接https://www.manhattanprep.com/gmat/forums/the-word-omitted-in-comparison-t32362.html

锕儍

别贝尔 发表于 2016-9-4 00:50
RON认为这个比较now than a year ago 是可以的，这个选项需要通过其他错误来排除

RON链接https://www.manh ...

搜噶，非常感谢！