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A cave in Central America was occupied by humans for much of the period from 9,000 to 500 years ago. Archaeological excavations in the cave have discovered remains of food plants at every level of habitation, increasing from fewer than ten food plant species in the earliest (lowest) levels to over 30 species in the latest levels. Clearly, later inhabitants of the cave used a greater variety of plants as food than earlier inhabitants did.

Which of the following, if true of the cave, most weakens the argument?

(A) Some of the plant species found in the earlier (lower) levels of habitation are not found at all in the later (upper) levels of habitation.

(B) The remains of some plant species, such as squash and chili peppers, show changes from the middle to the later (upper) levels that indicate domestication.

(C) At certain points during the period from 9,000 to 500 years ago, the cave was abandoned for a time and later reoccupied by people who were probably of a different culture than the earlier inhabitants

(D) Virtually all the plant remains found at earliest (lowest) levels of habitation are tough fibers that are relatively resistant to decomposition.

(E) The total volume of food plant remains found in the earlier (lower) layers was greater than that found in the later (upper) layers.

参*：D

文本大意为：中美洲的一个洞穴在之前的9000至500年间，有人类居住。考古学家发现其中不同时期遗留下的食物类植物。其中早期的有不到十种，后期有超过三十种。显然，后期居住者的食物种类更多。

题目要求选择一个选项，削弱文本论证。选项D符合：发现的早期食物几乎都是不容易被分解的茎类植物。也就是说，其他类型的食物可能因年代久远都已经被分解了，考古学家无法发现，故无法判断前期食物种类就比后期少。

GRE阅读时间问题如何解决?

很多同学在面对GRE阅读考试时，都会感叹时间不够，常会有考生来不及看完整篇阅读文章。其中做题速度无法达到要求的原因有很多，词汇量，阅读方法，做题技巧无一不是。此外，还有一个很重要的因素：不会取舍，不会衡量做题的优先性。鉴于GRE考试开弓没有回头箭的考试模式，如果在做阅读题时碰到了难度很高，预计会花费大量时间定位解析也难以保证正确率的题目，建议大家直接猜测答案后进入下一题，不要在这些题目上花费太多时间。学会取舍才能保证后续题目的解题时间，从而弥补损失，取得更好的成绩。