首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
A、They have very few hairs on their bodies. B、They bear their young rather than laying eggs. C、Their lungs are full of hot air a
A、They have very few hairs on their bodies. B、They bear their young rather than laying eggs. C、Their lungs are full of hot air a
admin
2010-11-02
13
问题
Millions of years ago, whales lived on land and walked on four legs. Today,whales still have small bones that are the remains of their hind legs, but these bones can only be seen on the inside of the whale. No one knows why whales left the land to live in the water.
However, scientists can imagine that when the whales changed their environment, their bodies underwent a change—taking on a more fish-like appearance. This new form offered less resistance to the water, enabling the whales to swim faster.
Despite their fish-like form, whales are not fish. A whale will drown, just as a man will, if it stays under water too long. When a whale is under water, it closes its nostrils tightly and holds its breath. The air in its lungs becomes very hot and full of water vapor. When the whale rises to the surface and exhales, its hot breath produces a column of water vapor that rises high in the air. A man produces the same effect when he exhales warm air on a cold morning.
Whales are classified as mammals because they bear their young, rather than laying eggs, and because the mother whales give the babies milk. Like other mammals, whales have warm blood. Their blood stays at the same temperature, even when they move from hot to cold water. They keep warm in cold water because they have a thick layer of fat just under their skins. This fat is called blubber, and it is thicker on whales that spend their lives in cold water. Almost all land mammals, except man, have hair on their bodies to keep them warm, but whales, which have very few hairs, are kept warm by their fat.
选项
A、They have very few hairs on their bodies.
B、They bear their young rather than laying eggs.
C、Their lungs are full of hot air and water.
D、They can walk on their hind legs on land.
答案
A
解析
细节题。根据原文中的最后一句话Almost all land mammals, except man, have hair on their bodies to keep them warm, but whales, which have very few hairs, are kept warm by their fat.(除了人以外,几乎所有的陆地哺乳动物都靠身上的毛取暖。而鲸鱼身上几乎没有毛,是靠它们的脂肪取暖。)可知,鲸和其他哺乳动物的区别在于取暖方式不同。选项A同原文的意思一致。B、C、D选项在
转载请注明原文地址:https://kaotiyun.com/show/mxs7777K
0
大学英语六级
相关试题推荐
A、Becausetheyhaveto.B、Becausetheywantto.C、Becausetheirchildrenwantthemto.D、Becausetheydon’tknowhowtospendth
Wearerapidlyneartheendofthiscourseinthehistoryof【B1】______music.Wehavecoveredseveralcenturiesinaveryshort
OnemajordecisionwhichfacestheAmericanstudentreadytobeginhighereducationisthechoiceofattendingalargeuniversit
Environmentliterallyis"thatwhichenvironsorsurrounds".Thetermisusedinvariouswaysinacademicdiscourse.Inbiology
Eachculturehasitsownformofacceptablegreetingbehavior,usuallybasedonthelevelofformalityfoundwithinthesociety.
A、Ithasdifferentcolor.B、Ithasairinside.C、Sedimentgetsstirredupandmixeswithwater.D、It’snotmentionedintheconv
A、MarywillcallofftheappointmentwithMrs.David.B、Theywillgotoamovieinsteadbecausetheyhaven’tgotticketsforthe
StressManagement:PersonallyAdjustingtoStressStressisastateofimbalancebetweendemandsmadeonusfromoutsidesou
OneofLondonZoo’srecentadvertisementscausedmesomeirritation,sopatentlydiditdistortreality.Headlined"Withoutzoos
Womenwhoapplyforjobsinmiddleorseniormanagementhaveahighersuccessratethanmen,accordingtoanemploymentsurvey.
随机试题
患者,女,30岁,发作时昏仆抽搐,吐涎,平时情绪急躁,心烦失眠,咯痰不爽,口苦且干,大便秘结,舌红,苔黄厚腻,辨证为痰火壅实,治宜选用
消费者在购买商品前已经知道该商品存在瑕疵,但经营者没有违反法律强制性规定,则经营者【】
慢性肾炎必有的临床表现是
A、血管炎B、出血性膀胱炎C、肺纤维化D、过敏性休克E、齿龈增生抗胸腺细胞球蛋白
期货公司申请金融期货经纪业务资格,应当向中国证监会提交的申请材料包括()。
一位教师走进教室时,刚刚推开虚掩着的教室门,忽然一把扫帚掉了下来,不偏不倚,正好打在教师的讲义夹上。课堂上一片哗然,这分明是学生搞的恶作剧。下列教师的处理方式中,最恰当的做法是()。
外出遇到雷雨天气不正确的做法是()。
对着电视画面拍照,应关闭照相机闪光灯和室内照明灯,这样照出的照片画面更清晰。这是因为()
下面( )不能将字变量X的属性修改为字节变量Y。
Thefatherwasdelightedtohearthechild______that.
最新回复
(
0
)