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题目材料：
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?
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ASome of the plant species found in the earlier (lower) levels of habitation are not found at all in the later (upper) levels of habitation.
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BThe remains of some plant species, such as squash and chili peppers, show changes from the middle to the later (upper) levels that indicate domestication.
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CAt 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.
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DVirtually all the plant remains found at the earliest (lowest) levels of habitation are tough fibers that are relatively resistant to decomposition.
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EThe total volume of food plant remains found in the earlier (lower) layers was greater than that found in the later (upper) layers.
D显示答案
