关于形容词修饰问题的疑问

112.
                Domestic automobile manufacturers have invested millions of dollars into research to develop cars more gasoline-efficient even than presently on the road.

(A) into research to develop cars more gasoline-efficient even than presently on the road

(B) into research for developing even more gasoline-efficient cars on the road than at present

(C) for research for cars to be developed that are more gasoline-efficient even than presently the road

(D) in research to develop cars even more gasoline-efficient than those at present on the road（D）

(E) in research for developing cars that are even more gasoline-efficient than presently on the road

Choice D, the best answer, uses the preposition than to compare two clearly specified and grammatically parallel terms, the cars the manufacturers hope to develop and those at present on the road. In A, the phrase more gasoline-efficient... than presently on the road does not identify the second term of the comparison. In B, the misuse of modifying phrases produces an ambiguous and awkward statement: even more gasoline-efficient cars could refer either to more cars that are efficient or to cars that are more efficient. Choices B, C, and E all use research for [verb] where the idiom requires research to [verb]. In addition, C awkwardly separates even from more, and C and E again fail to indicate the second term of the comparison.

more gasoline-efficient 会产生歧义

但是在Prep里面好几个题目都是用的这种一个形容词＋两个名词或者两个形容词＋一个名词的形式。例如：

82.   (28967-!-item-!-188;#058&003792)

Each year companies in the United States could save as much as $58 billion annually by preventing illness among employees and gain as much as $200 billion through improving performance of workers if they simply provided offices with cleaner air.

(A) annually by preventing illness among employees and gain as much as $200 billion through improving performance of workers if they simply provided

(B) annually if they prevented employee illness and gain as much as $200 billion through worker performance improved by simply providing

(C) annually in employee illness prevention and gain as much as $200 billion through worker performance improved by simply providing

(D) in employee illness prevention and gain as much as $200 billion through improving performance of workers if they simply provided

(E) by preventing illness among employees and gain as much as $200 billion through improved worker performance if they simply provided

此题正确选项为E。improved worker performance 也会产生歧义啊？？？

没人发现这些问题？？？还是没人能回答啊？？？

盼望牛牛快来！！！