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  3. The United States petroleum industry’s cost to meet environmental regulations is projected at ten percent of the price per barre

The United States petroleum industry’s cost to meet environmental regulations is projected at ten percent of the price per barre

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问题 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 this decade.
选项 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 this decade.
B、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、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 this decade.
E、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.
答案E
解析 仅E符合cost的第二种用法(作名词)，同时，也可以用时间状语by the end of thedecade要求的谓语动词时态来判定(查看时态一章)。在此时间状语下，谓语动词只能用将来时。而A、B、C、D无一例外地使用一般现在时；E不仅符合将来时态，同时it is estimatedthat的表达也符合习惯表达(在GRE中，也有类似cost的表达：an analysis of the cost to employeesof complying with such laws)。
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