[求助]陈向东的一题

willsum

原来如此。多谢指教。

醋醋妹妹

根据题意, 我们来推一下: 二氧化碳越多--->植物越大---> 这样植物死后的body也就越大--->然后要decay的东西也就越多--->decay越多产生的沼气越多--->greenhouse

willsum

我不是很懂，为何选D，请大牛指点。谢谢！

The large amounts of carbon dioxide now being released into the
atmosphere by the burning of fossil fuels will not, in effect, result in a
greenhouse effectan increase in average global temperatures.
Since plants use carbon dioxide in larger quantities if the supply is increased,
they are able to grow larger and multiply more vigorously, and atmospheric
carbon dioxide concertrations will eventually become stable.

Which of the following, if true, would most seriously weaken
the conclusion that a greenhouse effect will not result from the current release
of larger amounts of carbon dioxide into the atmosphere?

(A) The expectd rise in average blobal temperatures has not yet been observed.
(B) Ocean waters absorb carbon dioxide at a greater rae when the atmospheric concentration
of carbon dioxide is higher.
(C) Since the beginning of the Industrial Revolution, increased atmospheric concentrations
of carbon dioxide have resulted in improved agricultural productivity.
(D) When plants decay, they produce methane, another gas
that can have a marked greenhoouse effect.
(E) The fact that carbon dioxide levels have risen and fallen many times in the Earth's
history suggests that there is some biological process that can reverse the greenhouse effect.

答案是D。

另外，我发现陈向东的书里面，后面的解释都是些我懂的题目，而我不懂的，也最需要解释的题往往都没有详细的说明。很郁闷的说。