Cub-carrying also occurs among some other myrmecophagous (10) (ant-eating) mammals; therefore, one explanation is that cub-carrying is necessitated by myrmecophagy, since myrmecophagy entails a low metabolic rate and high energy expenditure in (15) walking between food patches. （解释一：减少能耗）How- ever, although polar bears’ locomotion is similarly inefficient, polar bear cubs walk along with their mother. Further- more, the daily movements of sloth (20) bears and American black bears— which are similar in size to sloth bears and have similar-sized home ranges— reveal similar travel rates and distances, suggesting that if black bear cubs are (25) able to keep up with their mother, so too should sloth bear cubs.（反驳：解释一。几种熊运动都差/大小相似/家的距离相似）
Q11: Which of the following, if true, would most weaken the author’ s argument in lines 18-26
(“ Furthermore … sloth bear cubs”)?逻辑题，削弱题：几种熊运动都差/大小相似/家的距离相似==》背孩子不是因为能量消耗的原因 A. Cub-carrying behavior has been observed in many non-myrmecophagous mammals.无 B. Many of the largest myrmecophagous mammals do not typically exhibit cub-carrying behavior.无 C. Some sloth bears have home ranges that are smaller in size than the average home ranges of black bears. D. The locomotion of black bears is significantly more efficient than the locomotion of sloth bears. E. The habitat of black bears consists of terrain that is significantly more varied than that of the habitat of sloth bears.无关比较点 答案是D 我选了C C为何不对呢 是不是因为some 所以跟原文并没有矛盾 可是削弱并不需要充分性 即使有一点削弱也行啊 请教大家 谢谢
C并不能削弱，原文已经说了（American black bears） are similar in size to （sloth bears ）and have similar-sized home ranges— reveal similar travel rates and distances,
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发表于 2004-8-31 09:12:00
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