首页
登录
职称英语
Since there is such an abundance of food in the sea, it is understandable th
Since there is such an abundance of food in the sea, it is understandable th
游客
2025-04-20
11
管理
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 that evolved on land should have returned to the sea. Those that did do that have flourished. Within about 50 million years—no time at all, geologically speaking —one of the four kinds of mammals that has 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 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. [br] Which of the following statements is supported by the passage?
选项
A、The whale’s ancestors were driven into the sea by humans.
B、The food supply of seals is being depleted by humans.
C、The whale evolved from a species of land-dwelling mammal.
D、Whales are a more efficient and adaptable species than humans.
答案
C
解析
根据文章第一段第三句“Within about 50 million years-no time at all,geologically speaking—oneof the four kinds of mammals that has returned to a marine environment has developed into the largest of all animalforms,the whale.”可知,在大约五千万年间——这在地质学上不过是弹指一挥间,返回海洋的四种哺乳动物之一的鲸已成为体积最庞大的动物。所以,根据文章可以推知,鲸曾经生活在陆地上。据此判断,答案是C。
转载请注明原文地址:https://tihaiku.com/zcyy/4045488.html
相关试题推荐
Mystudentsfoundthebook______;itprovidedthemwithanabundanceofin-for
Sincethereissuchanabundanceoffoodinthesea,itisunderstandableth
Sincethereissuchanabundanceoffoodinthesea,itisunderstandableth
Nowadaysthescatteringofgalaxiesandtheastoundingabundanceofstarsar
Nowadaysthescatteringofgalaxiesandtheastoundingabundanceofstarsar
Nowadaysthescatteringofgalaxiesandtheastoundingabundanceofstarsar
Nowadaysthescatteringofgalaxiesandtheastoundingabundanceofstarsar
Nowadaysthescatteringofgalaxiesandtheastoundingabundanceofstarsar
Nowadaysthescatteringofgalaxiesandtheastoundingabundanceofstarsar
Nowadaysthescatteringofgalaxiesandtheastoundingabundanceofstarsar
随机试题
Readthetextbelowaboutanaccountant.Choosethebestwordtofilleachgap,
Muchtimeandefforthasbeendedicatedtoresearchingthementalhealthben
[originaltext]Tomostforeigners,especiallythosefromtheeasternworld,su
Smokingmeanssomethingdifferenttovariouscultures.In【B1】______,manype
项目的工作分解结构是管理项目范围的集成,在进行项目工作分解时候,一般要遵循以下几
证券公司经营管理的主要负责人和()应当对月度报告签署确认意见。在证券公司月度报
下列关于存货的可变现净值的说法中,错误的有()A.为执行销售合同或劳务合
甲型强心苷元17位侧链为( )。A.六元不饱和内酯环 B.五元不饱和内酯环
关于合同成立时间的说法,正确的是()。A、口头合同自交付标的物时成立B、承诺生
根据《建筑法》,工程监理人员发现工程设计不符合建筑工程质量标准时,正确的做法是(
最新回复
(
0
)