一道题比较疑惑，请各位NN帮忙指点

biss33

这是陈向东上的一道例题：Prolonged and unreasonable frost rings in deciduous trees, which grew in morderate climates.Frost rings do not qppear in any of the fossilized deciduous trees that have been found in Antarctia.Hence, It is unlikely that such frosts occured in Antarctica at the time the fossilized trees lived.

Which of the following is an assumption on which the argument depends?

B  Deciduous trees are more likely to bear frost rings than are other tree varieties

C.  The process of fossilization does not completely obscure frost rings in deciduous trees.

正确答案是C,我当时选的是这个，可是我觉得B也对。因为我觉得这道题目前提和结论存在偷换概念，在前提中：题目讲fossilized deciduous trees如何如何，可是在结论中却归结到了fosslizied trees。所以，我觉得B选项正好为这种跨度加了一个桥梁——如果D树比起其它的树更加容易bear frost的话，而且他的fossilized 后也没有这种现象，那么所有的fossilized trees就都不会出现这种现象。

请各位NN指点，我这么想有什么错误？多谢了哈

[此贴子已经被作者于2005-4-23 12:38:58编辑过]

biss33

up up!