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
One of the greatest mysteries in the study of Cetacea [aquatic mammals] has always been that the creatures found in the stomachs
One of the greatest mysteries in the study of Cetacea [aquatic mammals] has always been that the creatures found in the stomachs
admin
2010-02-21
68
问题
One of the greatest mysteries in the study of Cetacea [aquatic mammals] has always been that the creatures found in the stomachs of toothed whales show no teeth marks. Now a University of California at Santa Cruz professor thinks he may have solved the enigma with what he calls the "big bang" theory of cetacean predation.
Ken Norris, natural history professor, believes that rather than use their teeth to attack their victims, toothed whales stun their prey with intense bursts of sound. He points out that all 68 species of odontocetes (a sub-order that includes dolphins) use sound to locate their victims, and suggests this ability may have evolved to the point where it could be used as a weapon.
Millions of years ago, the ancestors of whales had a narrow tapered jaw, streamlined for speed and bristling with long rows of sharp teeth. Today odontocetes are not adapted to surprising their prey or trapping it quickly. Most are more bulky than their forebearers; their teeth are short and unevenly spaced when they exist at all. Norris suggests that because of their sonar ability, whales’ teeth have become vestigial, like the human appendix.
It is difficult to test the big bang theory because in captivity, cetaceans tend to moderate their sonar so as not to deafen other creatures in their small, highly reflective tanks. Dolphins are known to politely turn off their echolocation systems when passing one another. And in the wild it’s hard to tell whether a sound came from a nearby animal or form another very far away.
But Norris points to the male narwhal as tacit proof of his theory. This whale has no teeth, and the single spiral tusk that extends about eight feet in front of him would seem to be more of an impediment than an aid in catching shrimp, his preferred feed. "You look at these animals and you wonder what’s going on."
It can be concluded from the passage that the "big bang" theory is ______.
选项
A、a fact
B、a disproved hypothesis
C、an unsupported opinion
D、an idea with some supporting evidence
答案
D
解析
第四段第一句"It is difficult to test the big bang theory because in captivity",第五段第一句"But Norris points to the male narwhal as tacit proof of his theory",综合起来也就是说该理论难以验证但有一些支持性的证据。
转载请注明原文地址:https://www.kaotiyun.com/show/ArIO777K
0
考博英语
相关试题推荐
•Lookatthenotesbelow.•Someinformationismissing.•Youwillhearamanbargainingforabetterprice.•Foreachquestio
Questions9-15•Lookatthenotesbelow.•Someinformationismissing.•Youwillheartwopeoplediscussinganinvoi
Whichchartshowslastweek’sproductionfigures?
NotesforJobInterviewMonthlypayoffered:【A1】______thousandBonusesoffered:【A2】semi-annualabout______thousandyuanDayso
A、Fourage-groupswerecompared.B、Age16-24hadthesteadiestlabourforce.C、Age25-44hadthegreatestincreaseinlabourfo
AGROWINGRESTAURANTCHAINSimonDale,thechairmanandfounderoftheDalehouserestaurantchain,yesterdayannouncedplan
ThisWorkingLifeByMaureenDowdIntheworldofbusiness,itisnotalwayseasyforwomentodothe(29)thingsasmen.
Perhapsallcriminalsshouldberequiredtocarrycardswhichread:Fragile;HandlewithCare.Itwillneverso,thesedaystog
Whentelevisionfirstbegantoexpand,veryfewofthepeoplewhohadbecomefamousasradiocommentators【31】effectiveontelev
Thefloorofhisstudywasoccupiedbya______massofbooksandpapers.
随机试题
幻灯片的格式是确定幻灯片放映顺序、时间、动画效果等内容时所进行的操作。()
学校区别于企业组织的根本性特点是()
Theyare______(number)superiortous.
毛泽东在《论十大关系》中提出了探索中国社会主义建设道路的任务。
下列关于污染创口的处理,叙述错误的是
集约型土地利用方式,是指依靠外延扩张,通过增加土地面积来满足获取土地收益的。()
统计文字资料:根据下面的文字资料。回答它后面的5道题目。根据《国务院关于开展第三次全国经济普查的通知》(国发[2012]60号)要求,我国进行了第三次全国经济普查。这次普查的标准时点为2013年12月31日,普查时期资料为2013年年度资料,普查对象是在
f(x)=x3+mx2-2mx-6除以x+2余2,则m的值为().
SomeinterestingrecentresearchbyateamfromMRCAppliedPsychologyUnitatCambridgeanalysedthesoundstructureofalarge
GeorgeHerbertMeadsaidthathumansaretalkedintohumanity.Hemeantthatwegainpersonalidentityaswecommunicatewithot
最新回复
(
0
)