分析 本文主要讲述了科学研究对于北极熊在冰封期、禁食季时的食物补给问题的调查.结果显示,他们极容易在那是体重减轻.
解答 63.B 细节题.根据文章内容Although some scientists previously believed land-based foods could supplement(补充)the bears'nutritional needs until the sea ice returns,a new study has revealed that access to terrestrial food is not sufficient to reduce the rate of body mass loss for fasting polar bears.尽管科学家之前相信,陆地食物补给可以满足北极熊的营养需求,但是最新的研究表明,在冰封时期没有海洋食物的支撑,北极熊靠陆地食物,体重有了大幅下降,结合选项,故选B
64.C 推理题.根据文章内容On average,polar bears lost 2.2 pounds(1 kilogram)of mass per day--exactly the same amount as free-ranging(自由放养的)bears measured during the ice-free season on the coastline of Hudson Bay.Scientists reported that even with land-based food opportunities,polar bears lost the same amount of weight.在研究过程中,熊被人为的饲养起来,而体重会每天的减少.减少的体重和冰封时期自由放养时减少的体重相似,结合选项,故选C
65.D 词义猜测题.根据文章内容Some studies have suggested that polar bears could adapt to land-based foods to offset the missing calories during a shortened hunting period on the ice,"一些研究表明,北极熊能够适应陆地食物来对减轻的体重进行弥补,结合选项,故D符合文意.
66.A 细节题.根据文章内容."Subadult polar bears have lower fat stores,and the added energy demands associated with growth,"未成年的熊更容易饿是因为他们为长大,身体的脂肪存储量小,其次他们需要更多的能量来使得自己成长,结合选项,故选A
点评 本文是科教类阅读理解.做这类题材阅读理解时要求考生对文章通读一遍,做题时结合原文和题目有针对性的找出相关语句进行仔细分析,结合选项选出正确答案.推理判断题也是要在抓住关键句子的基础上合理的分析才能得出正确答案,切忌胡乱猜测,一定要做到有理有据
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