关于比较，OG16三道自相矛盾，左右互搏的题目，求大神回答，相信很多同学都碰到过

弥小岛

一样的情况，截然不同的答案

Heating-oil prices are expected to be higher this year than last （认为last year's错误）
Prices at the producer level are only 1.3 percent higher now than those of a year ago （认为不加those of错误）
wild animals have less total fat than livestock fed on grain （OG认为that of livestock...错误但在上一句中又认为正确）

OG 16 104
Heating-oil prices are expected to be higher this year than last because refiners are paving about S5 a barrel more for crude oil than thev 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
正确答案是A，OG解释说C的话不应该用last year's 因为比的是时间

OG16 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
正确答案是B，OG解释说than后面需要补出比的是不同时间段的价格

OG16 111
According to recent studies comparing the nutritional value of meat from wild animals and meat from domesticated animals, wild animals have less total fat than do livestock fed on grain and more of a kind of fat they think is good for cardiac health.
(A) wild animals have less total fat than do livestock fed on grain and more of a kind of fat they think is
(B) wild animals have less total fat than livestock fed on grain and more of a kind of fat thought to be
(C) wild animals have less total fat than that of livestock fed on grain and have more fat of a kind thought to be
(D) total fat of wild animals is less than livestock fed on grain and they have more fat of a kind thought to be
(E) total fat is less in wild animals than that of livestock fed on grain and more of their fat is of a kind they think is
正确答案是B  但是认为会有歧义，这里又认为that of不能这么用 和90题矛盾

Heating-oil prices are expected to be higher this year than last （认为last year's错误）
Prices at the producer level are only 1.3 percent higher now than those of a year ago （认为不加those of错误）
wild animals have less total fat than livestock fed on grain （OG认为that of livestock...错误但在上一句中又认为正确）

以上三句都是正确答案
但是为什么第一句不能和第二句一样是 than last year's 或者 than those of last year呢？又为什么第三句又是不能是that of...
于是我就非常纠结疑惑，为什么两道题同样是比两个时间段的价格，一个要补出名词，一个不要呢，不是自相矛盾了吗

不知道有没有理解的大神能来释疑一下啊....

为什么last year's就不对 只能是last year 而前一题一定要those of a year ago呢

再次，求大神指教

弥小岛

UPUP

弥小岛

Upupupup  还是不知道last year's 哪里错了

slgbond

OG 16 104
Heating-oil prices are expected to be higher this year than (Heating-oil prices are expected to be) last (year)比的是prices？

slgbond

According to recent studies comparing the nutritional value of meat from wild animals and meat from domesticated animals, wild animals have less total fat than that of livestock fed on grain and have more fat of a kind thought to be  good for cardiac health（than that of livestock ）
livestock家畜=domesticated animals

slgbond

句子结构语义搞不清，故比较对象搞混乱，所以你像在蒙答案

slgbond

high enough so that 结构 …adj enough与so adj that 语义重复

弥小岛

slgbond 发表于 2016-6-18 18:40
OG 16 104
Heating-oil prices are expected to be higher this year than (Heating-oil prices are expect ...

比的是不同年的价格
但是下面这道题，比的也不是价格呀，不同的两个年份，为什么就要用those of了呢
Prices at the producer level are only 1.3 percent higher now than those of a year ago

弥小岛

slgbond 发表于 2016-6-18 18:43
According to recent studies comparing the nutritional value of meat from wild animals and meat from  ...

这道题我觉得比的是animal 的fat和livestock的fat  所以才这么选的.... 主要是被有一道 those of a years ago的这个正确答案弄湖了。。。不知道什么时候要省略而什么时候不要   

slgbond

Heating-oil prices are expected to be higher this year than (Heating-oil prices are expected to be) last (year)
省略的补全了还说比主语。比的不是主语prices，是状语啊this year，你再看看是不是