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、Why species don’t avoid extinction by adapting. B、Why species become extinct at the rate they do. C、Why humans aren’t extinct.
A、Why species don’t avoid extinction by adapting. B、Why species become extinct at the rate they do. C、Why humans aren’t extinct.
admin
2010-09-25
78
问题
W: Professor Marnes, I wonder if you can fill me in on your lecture last Friday. I had to attend a scholarship award ceremony.
M: Oh well, congratulations. I hope you were rewarded handsomely!
W: Well, every bit helps. So, about your lecture, I understand you were talking about extinctions.
M: Yes. Well, the crux of my talk was just that we tend to think of extinction as a dramatic event, but most species die out over quite a period of time.
W: Why do they die off? I thought they were continuously improving themselves. Natural selection, I think you once mentioned.
M: Ah, but you see while there is natural competition between the species, what determines which species survive is largely by chance.
W: I don’t get it. Why do species bother competing?
M: Well, there are short-term advantages. But many species also are helped by others. For example, the common housefly and cockroaches might have died off years ago if not for humans.
W: But you’re not saying that humans are so successful merely because of chance?
M: To a certain extent, humans were initially lucky enough to have the right weather conditions and a lack of predators, but now, of course, we survive by ingenuity!
W: So we may never become extinct.
M: No, because we may be in a crash course to extinction by our continuous exploitation of the environment. We are a relatively young species and our time is not yet overdue.
W: But there are 6 billion of us!
M: Yes and there’re many more houseflies too! Each with the capacity to spread one disease from one person to another in a fast period of time.
选项
A、Why species don’t avoid extinction by adapting.
B、Why species become extinct at the rate they do.
C、Why humans aren’t extinct.
D、How many species aren’t extinct.
答案
A
解析
四个选项都是由疑问词引导,均使用的是正常语序,故本题应该是针对what提问,内容很可能与物种灭绝有关。根据对话中女士提到的Why do they die off?…Natural selection,…可知,女士对物种不能够通过适应环境来避免灭绝这一问题感到很困惑,故答案为A。
转载请注明原文地址:https://kaotiyun.com/show/bnz7777K
0
大学英语六级
相关试题推荐
Rapidchangesintechnologyandincreasinginternationalcompetitionhaveledemployerstoseeknewstrategiesforproducinggoo
A、Apersonshouldprobablybetheleastafraidofadwarfshark.B、Apersonshouldprobablybetheleastafraidofatigershark
A、Theman’sprofessor.B、Theman’sroommate.C、Aneighbor.D、Theman’sbrotherB由文中的相关词“movein,apartment,aroomchange"可推断出他们
FactsaboutDepressionInanygivenone-yearperiod,9.5%ofthepopulation,orabout18.8millionAmericanadults,sufferf
TheDebateoverGeneticallyModifiedFoods•Ricewithbuilt-inVitaminAthatcanhelppreventblindnessin100millionchil
TheDebateoverGeneticallyModifiedFoods•Ricewithbuilt-inVitaminAthatcanhelppreventblindnessin100millionchil
TheWorldHealth【B1】______saysavianinfluenzacouldbecomeaworldwidethreatunlessgovernmentsactnowtostopit.Officials
A、Themancanhavehiscamerarepairedhere.B、Thewomanwillprobablyfixtheman’scameraherself.C、Themanshouldbuyanew
A、Hisroommate’staysawakeallnight.B、Hewanttoplayhisrecorderatnight.C、Thepresentoneistooexpensive.D、Thepresen
A、They’reexpensive.B、They’remuchfasterthanhydrogenballoons.C、TheyaremorefrequentlyusedintheUnitedStates.D、They’
随机试题
A.淋巴滤泡形成B.甲状腺滤泡破坏C.两者均有D.两者均无单纯性甲状腺肿
下列叙述违反《民用爆炸物品安全管理条例》规定的有()。
在计算机领域巾通常用MIPS来描述()。
在个人劳动力供给曲线的某一段上,随着工资率上升,劳动力供给反而逐渐减少,这种情况表明,工资率上升的()。
某村开展集体资产确权到户和股份合作制改革,实现了农村“资源变资产、资金变股金、农民变股东”。在立足供需对接的基础上,发展了农村集体经济,赢得了农民的高度认可。材料表明,发展农村经济应()。①不断完善农村生产关系②以市场为导向优化农业产业
侮辱、殴打、打击报复教师,应承担最为严厉的法律责任是()
方程x2+y2+ax+2ay+2a2+a-1=0表示圆,则a的取值范围是().
设X,y是相互独立的随机变量,它们的分布函数分别是Fx(x)、Fy(y),则Z=max(X,Y)的分布函数是().
(71)providesadatapathbetweentheCPUandexternaldevices.
在软件开发中,需求分析阶段产生的主要文档是( )。
最新回复
(
0
)