一道长划线 没有思路 求教大牛

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) 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 the 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.

我选的是A  E 的IT IS ESTIMATED不会显得复杂么

1. If industrial pollution continues to deplete the ozone layer, the resulting increase in ultraviolet radiation will endanger human health, causing a rise in the incidence of skin cancer and eye disease, and perhaps even threatening global ecological systems.
(A) and perhaps even threatening
(B) and may even threaten
(C) and even a possible threat to
(D) as well as possibly threatening
(E) as well as a possible threat to

选的是 A

我認為第一題主要考verb tense & idiom

cost of x to y or cost to y of x
注意到"by the end of the decade" -> future tense -> only E 

(只有E對  就不用比較it的問題了  而且It is estimated that也用得很好)

另外   "industry's cost" is incorrect 

時間狀語的位置  也是值得思考的一個考點   最好靠近修飾對象  而這題是動詞estimated

第二題   你題目劃的線要不要修正一下?

看到and -> parallelism ->找出平行對象

and之後是threaten global ecological systems  -> 甚麼東西可以threaten global ecological systems?

前面的increase in ultraviolet radiation

你選的A  threatening會造成和causing.....disease平行的錯覺   但comma卻禁止了與之平行的可能

只能是跟插入句之前的句子去平行

一點淺見  希望有幫助