请教一到逻辑，XDJM们进来帮个忙

kevinh1217

1.Prolonged and unseasoned frost produce frost rings in deciduous trees, which grow in moderate climates. Frost rings do not appear in any of the fossilized deciduous trees that have been found in Antarctica. Hence, it is unlikely that such frosts occurred in Antarctica at the time the fossilized trees lived. which of the following is an assumption on which the arguement depends? A There are fossilized nondeciduous trees from Antarctica that bear frost  rings. 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. D Present-day deciduous trees are more sensitive to changes in temperature than were the deciduous trees of ancient Antarctica. E Prolonged and unseasonable frosts that might have occurred in Antarctica when the now-fossilized trees were still living did not always produce frost rings in deciduous trees.

E为什么不可以

francoisyang

E的意思是，在化石树存活的年代发生的霜冻，并不会在树上造成霜冻轮。
原文的argument指的是因为化石树上无霜冻轮，所以那个年代没霜冻。而原文第一句就说明霜冻会造成霜冻轮，E与其矛盾，自然不构成前提假设。
答案应该是C。

suzibi

答案是C，
E典型的反对原文已述事实

kennichan2011

题目错了！C选项应该把not 去除才说得通 大家同意吗