分析 本文是一篇科教类阅读,属于说明文,本文以美国棕熊的毛色随地理分布而不同展开,主要从毛色,特点,吃的食物,冬眠行为以及交配方式等方面来向我们介绍了美国棕熊的生活习性.
解答 48.答案:B.推理判断题.根据"In the eastern part of their range(地理分布区),most of these bears have shiny black fur,but in the west they grow brown,red or even yellow coats.To the north,the black bear is actually gray or white.Even in the same litter(窝),both brown and black furred bears may be born."可推测出,美国棕熊的毛色随他们生活范围的不同而改变.故选B.
49.答案:A.细节理解题.根据"Their eyes and ears are small and their eyesight and hearing are not as good as their sense of smell."可知,美国棕熊的眼睛和耳朵很小,他们的视力和听力不像他们的嗅觉那么好,故棕熊的嗅觉比较好.故选A.
50.答案:A.细节理解题.根据"One of the most interesting characteristics of bears,including the black bear,is their winter sleep.Unlike many other animals,bears do not actually hibernate(冬眠)."可知,美国棕熊的冬眠行为是独特的.故选A.
点评 本文是一篇科教类阅读,题目涉及主旨大意题,细节理解题.做题时学生应仔细阅读原文,把握文章主要内容,联系文章上下文内容并结合所给选项含义,从中选出正确答案,一定要做到有理有据,切忌胡乱猜测.
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