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答案是E。为什么B不行呢？
我的理解 - 题目说的是原始人类用grass stalk来刷牙，其中包含一种物质可能会导致grooves。B说明有些原始人类用了grass stalk刷牙却没有出groove，不是也能evaluation of the anthropologist's hypothesis吗？
提前感谢大佬解答!!
Researchers have long noted strange grooves near the gum lines on dental remains of some early humans. The marks are absent from the teeth of modern-day toothpick users, and have therefore been assumed not to present evidence of tooth picking where they have been present. But an anthropologist has recently proposed that the early humans used grass stalks, which, unlike wood, contain abrasive silica, a substance that would facilitate the development of the grooves.
Which of the following would, if found to be true, be most useful to the evaluation of the anthropologist's hypothesis?
A. The dental remains that have the type of grooves in question almost as commonly show signs of tooth decay as do the remains that lack the grooves.
B. Dental remains of some of the early humans without the grooves have been found at places where the available grass could have been suitable for tooth picking during their lifetimes.
C. Unlike grass stalks, few modern-day toothpicks contain significant amounts of abrasive silica.
D. Abrasive silica derived from grasses and other, similar plants could be useful in the removal of cavity-causing plaque from humans' teeth.
E. The grooves occur on the teeth of some early humans whose remains were found at places where no grass suitable for tooth picking would have been obtainable during their lifetimes.
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发表于 2024-5-2 17:40:29
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