200. Certain pesticides can become ineffective if used repeatedly in the same place: one reason is suggested by the finding that there are much larger populations of pesticide-degrading microbes in soils with a relatively long history of pesticide use than in soils that are free of such chemicals.
A是答案,没有问题. 但是宾语比较,一般加THAT/THOSE啊.为什么这里没有呢?我真的搞不太清楚在什么情况下句子的什么部分相比.
建议LZ查阅一下置顶帖的知识点连接，里面有前人总结的比较省略问题。
谢谢.我有查过了.但是我还是分不太清楚什么是宾语比较,什么是主语比较.
举个例子吧 来自熏衣紫草的贴子
OG 118
The question of whether to divest themselves of stock in companies that do business in South Africa is particularly troublesome for the nation's 116 private Black colleges because their economic bases are often more fragile than most predominantly White colleges.
(A) than
(B) than those of
(C) than is so of
(D) compared to (B)
(E) compared to those of
B中的those指代bases. than后谓语动词are省略，因为没有歧义。
结论：在不同宾语之间比较，一般都会用到代词，且代词极少（我不敢制定公理，所以不说“绝对”）出现they/it, 因为虽然是同类，但不是同一样东西(X的a与Y的b)。谓语动词的省略根据是否产生歧义而定。
我的问题:because their economic bases are often more fragile than most predominantly White colleges.在我看来明明是主语的比较啊. 是ECONOMIC BASES比较啊,因为二者有不同定语所以用THAT取代原来相同的部分啊.请哪位NN告诉我错我在哪里啊
另个支持我观点的例子
Several studies have found that the coronary patients who exercise most actively are at least fifty percent less likely than those who are sedentary to die of a heart attack.（主语相同且有定语成分，必须要that/those来指代
我的一点看法，供参考。我自己总结的，与网上有区别。
我把所有的比较都看成是句子的比较，只不过是有的时候两者相同成分多，相同成分少。究竟哪部分比较，我自己定义为是“不同的部分的名称”。（我看过不少关于比较的总结，感觉有人对于比较什么成分的定义不同，有时有误解）
以你的例子讨论：
1)
200. Certain pesticides can become ineffective if used repeatedly in the same place: one reason is suggested by the finding that there are much larger populations of pesticide-degrading microbes in soils with a relatively long history of pesticide use than in soils that are free of such chemicals.
句子的骨干是:
There are larger sth in soils A than in soils B, 所以是地点状语的比较，根本不涉及主语或宾语，than后要求完整状语(一般是介词词组），与补不补that/those无关。 2) The question of whether to divest themselves of stock in companies that do business in South Africa is particularly troublesome for the nation's 116 private Black colleges because their economic bases are often more fragile than most predominantly White colleges. 同意你的观点，此题是主语的比较，因为还原成句子是： their conomic bases are more fragile than the economic bases of White colleges are. 在无歧义的情况下，省略are, 题干又漏掉的the economic bases, 所以需要those来代替。 我想熏衣紫草大牛把这题归为宾语比较是从A of B的角度出发的，定义不同，但我还是认为归为主语比较更合理。 3) Several studies have found that the coronary patients who exercise most actively are at least fifty percent less likely than those who are sedentary to die of a heart attack.（主语相同且有定语成分，必须要that/those来指代 这题我认为与上两题不同，虽然是主语的比较，但不涉及是否补that/those, 因为than后就缺一个主语，用those或patients who are..都可以。 一家之言，供参考。
所以是地点状语的比较，根本不涉及主语或宾语，than后要求完整状语(一般是介词词组），与补不补that/those无关。
2)
The question of whether to divest themselves of stock in companies that do business in South Africa is particularly troublesome for the nation's 116 private Black colleges because their economic bases are often more fragile than most predominantly White colleges.
同意你的观点，此题是主语的比较，因为还原成句子是：
their conomic bases are more fragile than the economic bases of White colleges are. 在无歧义的情况下，省略are, 题干又漏掉的the economic bases, 所以需要those来代替。
我想熏衣紫草大牛把这题归为宾语比较是从A of B的角度出发的，定义不同，但我还是认为归为主语比较更合理。
3)
Several studies have found that the coronary patients who exercise most actively are at least fifty percent less likely than those who are sedentary to die of a heart attack.（主语相同且有定语成分，必须要that/those来指代
这题我认为与上两题不同，虽然是主语的比较，但不涉及是否补that/those, 因为than后就缺一个主语，用those或patients who are..都可以。
一家之言，供参考。
同意行缘,是状语得比较...
p.s:你修改过后可以预览下,如果成功的,那就可以删除重复的吧?以前我也试过修改不成功.呵呵.
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