Which of the following best completes the passage below?

At a recent conference on enviormental threats to the North Sea, most participating countries favored uniform controls on the quality of effluents, whether or not specific enviormental damage could be attributed to a particular source of effluent. What most, of course, be shoiwn, in order to avoid excessively restrictive controls, is that ___.

a\ any uniform controls that are adopted are likely to be implemented without delay

b\ any substance to be made subject to controls can actually cause enviormental damage

c\ the countries favoring uniform controls are those generating the largest quantities of effluents

d\ all of any given pollutant that is to be controlled actually reaches the North Sea at present

e\ enviromental damage already inficted on the North Sea is reversible

请牛牛  给解释下题目    然后 想问下  D为什么不对？  OG给的解释 想不通

没有想通D为什么不对。在查阅了前人的讨论后想通了。

污染物和产生环境危害是两件事情。污染物流到海里，不一定就会产生环境污染；不

流到海里，也可能产生环境危害。

又翻了OG的解释   突然想出了一种可以接受的解释

按照OG的说法   D是在讨论某一种污染物质（A POLLUTANT）

我认为OG的解释是说D是说这种污染物必须全部进入北海才需要被控制，而实际上只

要这种污染物中的部分会进入北海（其它的可能通过其它渠道排放、分流） 就应该

对其加以控制。

就是说  如果D对的话  实际上反而会限制所控制的污染物的种类（而造成管理上的

不全面）   而不会造成  excessively restrictive controls

OG对D的解释：it is not necessary to prove that all of a pollutant reaches

the North Sea. It is necessary to prove only that some of it does.

如果能正确翻译OG的解释   理解应该就米问题了