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
2013-07-01
29
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.
Questions:
33. How does a whale keep itself warm?
34. What do we learn about the blood temperature of a whale?
35. In what way do whales distinguish themselves from other land mammals?
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 tokeep 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选项在文章中均有提及,都是鲸鱼与其他哺乳动物的相似之处。答案是A。
转载请注明原文地址:https://kaotiyun.com/show/qNn7777K
0
大学英语六级
相关试题推荐
Peoplecanpasssuperstitionsdownfromgenerationtogenerationbecauseof______.Accordingtothepassage,unlikeluckypeop
NationalGuardtroopsareintendedbythepresidentto______.Theauthorofthispassageisprobably______.
A、Apetdog.B、Thesonofthecouple.C、Apetcat.D、Theman’syoungerbrother.B本题问“根据对话内容,Max可能是谁”。文中提到的“grandmother”表明Max是这对夫
12ThingsI’veLearnedFromTravelingAroundtheWorldforThreeYearsOnMarch13,2007,Ihandedoverthekeystomyhouse
Advertisementcanbethoughtof"asthemeansofmakingknowninordertobuyorsellgoodsorservices".Advertisementaimsto
A、Sportevents.B、Culturalactivities.C、Counseling.D、Creativeactivities.C信息明示题。文章最后一段指出,青年俱乐部和青年中心鼓励成员参与体育、文化和创造性活动,以及社会服务,而
A、Mary’sEnglishteacherisMark.B、Mary’sChineseteacherisMark.C、MaryandMarkaregoodfriends.D、MaryandMarkareoffice
A、Graduatestudents.B、Undergraduatestudents.C、Professors.D、Libraryemployees.BWhichpeopleareusuallynotallowedtouset
A、Wecaninventwaysofincreasingrainfall.B、Wecandevelopwaysofreusingwaterandutilizingseawater.C、Wecancutdowno
A、Itisextremelywet.B、Itisrathercool.C、Ithasadryclimate.D、Itvariesoneachregion.D
随机试题
下列哪种证人证言可以作为证据运用()
男性,45岁,坠入热油池中烫伤头面颈、躯干、四肢、臀部3小时。伤后创面疼痛,口干、烦渴、气促。入院查体:T36.2℃,P143次/分,R32次/分,BP143/79mmHg。神志清楚,四肢凉,脉搏弱,末梢循环尚可,面颈部肿胀。烧伤面积98%,其中深Ⅱ度35
A.噻嗪类利尿剂B.α受体阻滞剂C.血管紧张素转换酶抑制剂D.二氢吡啶类钙通道阻滞剂E.β受体阻滞剂合并糖尿病的高血压患者,血清肌酐正常,降压治疗宜首选的药物是()
脑血栓形成的患者用药护理中用甘露醇时应注意哪项检查()
(2005年)折杆受力如图5—63所示,以下结论中错误的为()。
在如图所示电路中,开关S闭合后,金属环A()。
预收出租固定资产租金这笔业务使企业()。
根据下面材料。回答下列题目:××公司发行在外股票数:2007年155万股,2008年1800万股。平均股价:2007年13元/股,2008年15元/股。2008年派发现金股息:500万元。表14-1和表14-2分别为××公司的资产负债表、损益表的有关资料
设积分区域D={(x,y)|x2+y2≤x+y},计算二重积分(x2+xy+y2)dσ.
对于列表框控件List1,能够表示当前被选中列表项内容的是( )。
最新回复
(
0
)