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问题11, which of the following, if true, would most weaken the author's augument in lines 18-26.
下面是18-26的原文: furthermore, the daily movements of sloth 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 able to keep up with their mother, so too should sloth bear cubs.
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.
答案是D, 但我做题时, 见问的是weaken, 马上选了C, 因为18-26原句中破折号间提到home ranges 的问题. locomotion 是在前句谈polar bear 的时候提到, 为什么这一题答案是D.
请指教. 祝考试顺利!! | 
