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30: The

United States

petroleum industry’s cost to meet environmental regulations is projected at ten percent of the price per barrel of refined petroleum by the end of the decade.

A: The United States petroleum industry’s cost to meet environmental regulations is projected at ten percent of the price per barrel of refined petroleum by the end of the decade.

B: It is estimated that by the end of the decade the cost to the United States petroleum industry of meeting environmental regulations will be ten percent of the price per barrel of refined petroleum.

C: By the end of the decade, the United States petroleum industry’s cost of meeting environmental regulations is projected at ten percent of the price per barrel of refined petroleum.

D: To meet environmental regulations, the cost to the United States petroleum industry is estimated at ten percent of the price per barrel of refined petroleum by the end of the decade.

E: The United States petroleum industry’s cost by the end of the decade to meet environmental regulations is estimated at ten percent of the price per barrel of refined petroleum.

c 中主要是is projected at awkward.好像cost从来不用这个词来解释。。

"industry’s cost to meet..." in A is idiomatic; "industry of meeting" in B and C is awkward, hereby both these 2 options can be eliminated.

我想is projected at 应该不这么说，因该改成is projected to (be) ten...

A: The United States petroleum industry’s cost to meet environmental regulations is projected at ten percent of the price per barrel of refined petroleum by the end of the decade.时间状语修饰有歧义

C: By the end of the decade, the United States petroleum industry’s cost of meeting environmental regulations is projected at ten percent of the price per barrel of refined petroleum.清楚

D: To meet environmental regulations, the cost to the United States petroleum industry is estimated at ten percent of the price per barrel of refined petroleum by the end of the decade. 时间状语修饰有歧义

E: The United States petroleum industry’s cost by the end of the decade to meet environmental regulations is estimated at ten percent of the price per barrel of refined petroleum. 还是时间状语的问题

在这个题中， by the end of the decade 可以用来修饰2个概念，cost or price.As we know, the cost won't change so much, but rather the price are changing all the time, so I think that the time ( by the end of the decade ) will be used to modify price. It means the cost will be 10% of the price by the end of the decade.

但是说句实话，C很容易被选的，的确比较清楚，就是时态不过关

B：It is estimated that by the end of the decade the cost
            to the United States petroleum industry（可以放到后面去）
            of meeting environmental regulations
            will be ten percent of the price per barrel of refined petroleum.

但是说句实话，C很容易被选的，的确比较清楚，就是时态不过关

以下是引用gonghao在2006-5-12 12:12:00的发言：

By the end of the decade是时态标志：将来时

C：is projected不符

另外C强调了时间，到了什么时候。。。。。

题目的中心时价钱的比较，有点改变句子重心的感觉

但是说句实话，C很容易被选的，的确比较清楚，就是时态不过关

包括：A,C,E

B：It is estimated that by the end of the decade the cost
   to the United States petroleum industry（可以放到后面去）
   of meeting environmental regulations
   will be ten percent of the price per barrel of refined petroleum.

形式主语结构，不错的啊

by the end of the decades 的意思可以理解但是感覺上未必非要用未來式不可 ex.General Motors executives plan to build an electric-hybrid sedan by the end of the decade and sell it at a price similar to competing vehicles.(摘自某網路新聞)