14.American black bears appear in a variety of colors despite their name.In the eastern part of their range(地理分布區(qū)),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(窩),both brown and black furred bears may be born.
Black bears are the smallest of all American bears,ranging in length from 5to 6feet,weighing from 300to 500pounds.Their eyes and ears are small and their eyesight and hearing are not as good as their sense of smell.Like all bears,the black bear is shy,clumsy(笨拙的) and rarely dangerous.However,if cornered,the black bear can become a fearful enemy.
Black bears feed on leaves,roots,fruit,insects,fish and even larger animals.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).Although the bear does not eat during the winter months,its temperature remains almost normal,and it breathes regularly four or five times per minute.
Most black bears live alone,except during the mating season (交配季節(jié)).A litter of one to four cubs is born in January or February and they remain with their mother until they are fully grown or about one and a half years old.Black bears can live as long as thirty years in the wild,and even longer in game preserves set aside for them.

48.What do we know about the fur color of American black bears?B.
A.Most of them have black fur.
B.Their fur color depends on their living range.
C.They change their fur color throughout their life.
D.They are always of the same fur color as their brothers.
49.American black bears have a good sense ofA.
A.smell
B.hearing
C.eyesight
D.taste
50.Which of the following is TRUE about American black bears?A.
A.Their way of"hibernating"is unique.
B.They are able to live at most thirty years.
C.They are regarded as the smallest bear in the world.
D.The babies can soon live by themselves after birth.

分析 本文是一篇科教類閱讀,屬于說明文,本文以美國棕熊的毛色隨地理分布而不同展開,主要從毛色,特點,吃的食物,冬眠行為以及交配方式等方面來向我們介紹了美國棕熊的生活習(xí)性.

解答 48.答案:B.推理判斷題.根據(jù)"In the eastern part of their range(地理分布區(qū)),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(窩),both brown and black furred bears may be born."可推測出,美國棕熊的毛色隨他們生活范圍的不同而改變.故選B.
49.答案:A.細(xì)節(jié)理解題.根據(jù)"Their eyes and ears are small and their eyesight and hearing are not as good as their sense of smell."可知,美國棕熊的眼睛和耳朵很小,他們的視力和聽力不像他們的嗅覺那么好,故棕熊的嗅覺比較好.故選A.
50.答案:A.細(xì)節(jié)理解題.根據(jù)"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,美國棕熊的冬眠行為是獨特的.故選A.

點評 本文是一篇科教類閱讀,題目涉及主旨大意題,細(xì)節(jié)理解題.做題時學(xué)生應(yīng)仔細(xì)閱讀原文,把握文章主要內(nèi)容,聯(lián)系文章上下文內(nèi)容并結(jié)合所給選項含義,從中選出正確答案,一定要做到有理有據(jù),切忌胡亂猜測.

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