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
Since there is such an abundance of food in the sea, it is understandable that some of the efficient, highly adaptable, warm-blo
Since there is such an abundance of food in the sea, it is understandable that some of the efficient, highly adaptable, warm-blo
admin
2009-06-28
33
问题
Since there is such an abundance of food in the sea, it is understandable that some of the efficient, highly adaptable, warm-blooded mammals(哺乳动物) that evolved on land should have returned to the sea. Those that did have flourished. Within about 50 million years — no time at all, geologically speaking — one of the four kinds of mammals that have returned to a marine environment has developed into the largest of all animal forms, the whale. A second kind, the seal, has produced what is probably the greatest population of large carnivorous mammals on Earth.
This suggests that these "top dogs" of the ocean are prospering and multiplying. However, such has not been the case, at least not for the last 150 years. Trouble has closed in on these mammals in the form of equally warm-blooded and even more efficient and adaptable predators, humans.
At sea, as on land, humans have now positioned themselves on the top of the whole great pyramid of life, and they have caused serious problems for the mammals of the sea. There is a simple reason for this. Marine mammals have the misfortune to be swimming aggregates of commodities that humans want: fur, oil and meat. Even so, they might not be so vulnerable to human depredation if they did not, like humans, reproduce so slowly. Every year humans take more than 50 million tons of fish from the oceans without critically depleting the population of any species. But the slow-breeding mammals of the sea have been all but wiped out by humans seeking to satisfy their wants and whims.
选项
A、whales
B、seals
C、carnivorous animals
D、mammals
答案
D
解析
这是一道综合题。从全文看,整篇文章都是在谈论哺乳动物。
转载请注明原文地址:https://kaotiyun.com/show/hZwK777K
本试题收录于:
大学英语三级B级题库大学英语三级分类
0
大学英语三级B级
大学英语三级
相关试题推荐
Themeansbywhichanartformpresentsitsmessageisreferredtoasthemedium.Thus,soundproducedbyinstrumentsorhumanvo
LastSeptember,apartnershipbetweentheUnitedNationsandthesearchengineGooglewasannounced.AspartoftheUnitedNatio
Thereasonis_____heisunabletooperatethemachine.
A、Adviceonplantingroses.B、Howtochooseroses.C、Differenttypesofroses.D、Howtowaterroses.A短文开篇提到,有人说玫瑰很难种植,但讲话者说如果从一
A、Motherandson.B、Sisterandbrother.C、Teacherandstudent.D、Classmates.C男士为在女士任教学科的考试中表现不佳表示抱歉,女士表示没关系,并说她知道男士已经尽了最大努力了。由此
Haveyouevernoticedthatthereisnoshortageofpeoplewillingtogiveyouadvice,whetherornotyouaskforit?I’ve【T1】___
Inthepast,therailroadprovidedthefastestandmostefficientkindoftransport.Atthepresenttime,trainsarestill【11】;
Inthepast,therailroadprovidedthefastestandmostefficientkindoftransport.Atthepresenttime,trainsarestill【11】;
Inthepast,therailroadprovidedthefastestandmostefficientkindoftransport.Atthepresenttime,trainsarestill【11】;
随机试题
阅读下面程序publicclassOperatorsAndExpressions{voidequalsMethodl(){Stringsl=newString(“howareyou”);Strings2=newString(“howarey
患者下痢日久不愈,时发时止,腹胀食少嗜卧怕冷,常饮食不当、受凉、劳累而发发作时大便次数增多,黏液夹有血液,舌淡苔腻,脉虚而数。痢疾发作时,粪便镜检30~40个白细胞/高倍视野。其证是
患儿,男,14岁。上颌牙龈时常流脓多日。查深龋,探无穿髓孔,松动Ⅱ度,叩(±),温测无反应。患牙唇侧根尖处有一瘘管。临床治疗宜采用
资本主义工资的本质不是______的价值或价格,而是______的价值或价格。它有两种基本形式,即计时工资和计件工资。
采用电算化替代手工记账之前,根据规定计算机与手工并行()。
AfterIfinishedtheschoolthisyear,Ibeganto【M1】_______lookforwork.Nowseveralmonthlater,Istillhadn’t【M2】_______
通过招标、拍卖、公开协商等方式承包荒地等农村土地,依照有关规定,其土地承包经营权的流转方式包括
世界上第一个智力量表是_____________。
ぎゅうにゅうがくさると______なります。
Accordingtopsychologists,acompulsivespenderwantstospendalotofmoneybecause:
最新回复
(
0
)