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　　修饰歧义：

　　现在分词结构在句尾可作定语修饰紧临的名词，也可作状语修饰整个句子，所以在这种情况下需要特别注意，通常优先作定语修饰名词，如果不符合逻辑，则是作状语修饰句子，如果二者都能理解符合逻辑，则说明该分词结构有修饰歧义。多个修饰成分在修饰相同的对象时，之间要加上连词，否则会导致修饰歧义。

　　Due to poaching and increased cultivation in their native habitats, researchers have determined that there are fewer than 100 Arabian leopards left in the wild, and that these leopards are thus many times as rare as China's giant pandas.

　　(A) Due to poaching and increased cultivation in their native habitats, researchers have determined that there are fewer than 100 Arabian leopards left in the wild, and that these leopards are thus many times as rare as

　　(B) Due to poaching and increased cultivation in their native habitats, there are fewer than 100 Arabian leopards left in the wild, researchers have determined, making them many times more rare than

　　(C) There are fewer than 100 Arabian leopards left in the wild due to poaching and increased cultivation in their native habitats, researchers have determined, which makes the leopards many times more rare compared to

　　(D) Researchers have determined that, because of being poached and increased cultivation in their native habitats, there are fewer than 100 Arabian leopards left in the wild, thus making them many more times as rare as

　　(E) Researchers have determined that, because of poaching and increased cultivation in their native habitats, there are fewer than 100 Arabian leopards left in the wild, and that these leopards are thus many times more rare than

　　句子结构：Researchers have determined that, because of…, …, and that…Determined后跟that引导的并列的宾语从句说明determine的内容，because of…作插入语说明原因。

　　考点：比较、逻辑表达

　　1) 比较-倍数的表达，表达倍数用“… times + more +adj.+than，… time as +adj.+than”都正确。

　　2) 逻辑表达，状语位置不能随意改变。

　　(A) due to…原因状语修饰主句，修饰对象错误。

　　(B) researchers have determined位置错误，产生修饰歧义;现在分词结构making…有修饰researchers have determined的歧义。

　　(C) researchers have determined位置错误，产生修饰歧义;which不能指代句子;more… compared to搭配错误。

　　(D) 现在分词making…修饰对象不清楚;many more times中more多余。

　　(E) 正确，determine后跟并列的宾语从句，many times more … than…比较结构表达准确。

　　夹心修饰：

　　所以歧义修饰，是因为引发了不同的理解，而并不是语法上是否会有不同的修饰，所谓夹心修饰也是这个原则。很多人对“夹心修饰”都有过一个误解，认为S, v-ing, V. + O.结构中，v-ing既可以往前修饰S，也可以往后修饰V就是夹心，而实际上夹心并不是“可以往前修饰S，也可以往后修饰V” 。在S, v-ing, V. + O.这样的表达中，v-ing约定俗成只伴随修饰动词。

　　When a ton of wheat was being moved from Buffalo to New York City before the opening of the Erie Canal in 1825, it took three weeks and cost $100, but when the canal was used, it took less than eight days and cost less than $6.

　　A. When a ton of wheat was being moved from Buffalo to New York City before the opening of the Erie Canal in 1825, it took three weeks and cost $100, but when the canal was used, it

　　B. Moving a ton of wheat from Buffalo to New York City before the opening of the Erie Canal in 1825, it took three weeks and cost $100; using the canal, it

　　C. Before the opening of the Erie Canal in 1825, moving a ton of wheat from Buffalo to New York City took three weeks and cost $100; on the canal the move

　　D. In 1825, before opening the Erie Canal, to move a ton of wheat took three weeks from Buffalo to New York City, which cost $100; moving it on the canal

　　E. To move a ton of wheat in 1825 from Buffalo to New York City took three weeks before the opening of the Erie Canal, costing $100, but in using the canal, the move

　　翻译：

　　在伊利运河开凿前，一吨小麦从布法罗被运到纽约市于1825年，花了三个星期，耗资100，但是当运河被使用，运输花了不到8天，并花费少于$ 6。

　　句式：

　　Before the opening of the Erie Canal in 1829,moving a ton of wheat took three weeks, on the canal the move took three weeks, but when... It took....

　　思路：

　　考的就是对称，对比 有了canal 之前和之后，那么最好用两个句子完成，中间 用分号隔开，形成对比。见到it 考虑指代是否恰当。

　　选项：

　　A. it 语义上是指a ton was moved from B to N这一个过程，但是语法上指a ton of wheat;

　　B. 同A，it指代错误，it不能指代一个句子。Moving修饰句子后面的it,逻辑语义不对;

　　C. 正确;

　　D. which 就近指代了new york;

　　E. 从结构上看，由于 but 前面是逗号，costing 即可以伴随前面的 took 3 weeks，也可以与后面的 using the canal 并列，是“夹心饼干”。而且 the move 不可作 in using the canal 的逻辑主语，其逻辑主语应该是人。

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