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作者: zephyr1977    时间: 2002-9-30 22:37     标题:

11. Logging industry official: Harvesting trees from old-growth forests for use in manufacture can reduce the amount of carbon dioxide in the atmosphere, since when large old trees die in the forest they decompose., releasing their stored carbon dioxide. Harvesting old-growth forests would, moreover, make room for rapidly growing young trees, which absorb more carbon dioxide from the atmosphere than do trees in old-growth forests.

Which one of the following, if true, most seriously weakens the official's argument?

(A) Many old-growth forests are the home of thousands of animal species that would be endangered if the forests were to be destroyed.

(B) Much of the organic matter from old-growth trees, unusable as lumber, is made into products that decompose rapidly.

(C) A young tree contains less than half the amount of carbon dioxide that is stored in an old tree of the same species.

(D) Much of the carbon dioxide present in forests is eventually released when wood and other organic debris found on the forest floor decompose.

(E) It can take many years for the trees of a newly planted forest to reach the size of those found in existing old-growth forests.

为什么选B 啊? 请赐教。
作者: qiufeng1990    时间: 2002-10-1 00:14

我也是看过答案来到推:
A),E) 无关,C),D)支持
B) 许多老树的有机物照样会decompose rapidly,制造carbon dioxide。
作者: tongxun    时间: 2002-10-1 01:14

原文的论据是说造房子会减少greenhouse gases emition,因为不这么做木会腐烂并释放出这些气体,他的前提是老木造了房子就不会腐烂,或至少比不这么利用腐烂的速度慢。




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