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  3. The North American red squirrel has expanded its range into Indiana in conju

The North American red squirrel has expanded its range into Indiana in conju

游客2025-02-19  21
问题     The North American red squirrel has expanded its range into Indiana in conjunction with an increase in the fragmentation of forests due to agriculture and with a decrease in the number of gray squirrels, whose population is sensitive to forest fragmentation. Red squirrels tend to hoard food in a central location, while gray squirrels are scatter hoarders. Burial of nuts by scatter hoarders is highly beneficial for the regeneration of nut-producing trees. Red squirrels would have to collect 1,000 walnuts to achieve the same germination success that results from the handling of 150 walnuts by gray squirrels. If red squirrels successfully colonize the fragmented landscapes of Indiana in response to decreasing numbers of gray squirrels, they may not compensate completely for the loss of gray squirrels as seed dispersers. [br] Select the sentence in the passage that provides an illustration of a claim stated elsewhere in the passage.
选项
答案 Red squirrels would have to collect 1,000 walnuts to achieve the same germination success that results from the handling of 150 walnuts by gray squirrels.
解析 本题的关键是illustration(详细阐明)。所谓“详细阐明”，指的就是把之前的事情说得更清楚，因此文中唯一符合条件的就是第四句。因为第四句的前一句只是说灰松鼠对森林再生更有利，没有解释灰松鼠对森林再生更有利的原因。第四句对此进行详细阐明，通过1000、150这样的数据来说明红松鼠传播种子的效率不高。
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