11. Less than 50 percent of a certain tropical country’s wildlands remains intact. Efforts are under way to restore biological diversity in that country by restoring some destroyed wild habitats and extending some relatively intact portions of forests. However, opponents argue that these efforts are not needed because there is still plenty of wildland left.

Which of the following, if true, most significantly weakens the argument of the opponents of conservation efforts?

(A) As much, if not more, effort is required to restore a wild habitat as to preserve an intact habitat.

(B) The opponents of restoration efforts are, for the most part, members of the wealthier classes in their own villages and cities.

(C) Existing conservation laws have been very effective in preserving biological diversity within the wildlands that remain intact.

(D) For many tropical species native to that country, the tropical wildlands that are still relatively intact do not provide appropriate habitats for reproduction.（D）

(E) If a suitable population of plants and animals is introduced and is permitted to disperse and grow, tropical habitats can most certainly be restored. 請問(A)是什麼意思？為什麼要選(D)?

Less than 50 percent of a certain tropical country's wildlands remains intact. 描述的是一种情况。

Efforts are under way to restore biological diversity in that country. 说的是这要达到的结果。

by restoring some destroyed wild habitats and extending some relatively intact portions of forests.说的是要达到结果要采取的方法，但这种方法缺乏证据支持。

However, opponents argue that these efforts are not needed because there is still plenty of wildland left. 是反对采用这种方法的理由。

最终的结果就是要达到restore biological diversity，而D强调了如果没有通过前面所说的方法，就无法达到restore biological diversity这个结果。所以weaken了后面反对者的理由，加强了前面采用方法的正确性。

不知我的解释是否能理解。

[此贴子已经被作者于2005-3-23 21:13:26编辑过]

谢谢赐教,在你的提示下我想明白了.