In order to store energy during the winter，they require fatty foods.When the climate turns cold，most of them create a den(兽穴)and start sleeping inside for a few weeks，which is known as hibernation(冬眠)．When they sleep，their heart rate slows down to eight beats per minute from the average 40 beats per minute.Like polar bears，the female grizzlies also give birth to twins cubs during the winter. enough to live on their own.They grow fast as they drink the milk of their mother which contains heavy amounts of fat and calories.The mommy grizzlies are very protective in nature，and they take very good care of their cubs.They f they feel their cubs are threatened.

　　解题导语　本文是一篇科普知识类说明文，介绍了灰熊的栖息地、生活习性、体态特征等信息。

　　．h.

　　B．An adult male grizzly weighs more than twice as much as a female one.

　　C．Grizzly bears can not run fast because of their giant physical structure.

　　D．Grizzly bears can stand to have a better view of the surroundings.

　　C　[细节理解题。由文章第一段中的“when a mother bear has to feed her cubs until they grow enough to start their own families”可知A项正确，由第二段中的第二句和第三句可知B项正确，由第二段中的最后一句可知D项正C项不正确。所以选C。]

　　”．rs with strong shoulder and long claws

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