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
Many people feel that human beings should be responsible for the disappearance of some other animal species. It is true we may【M
Many people feel that human beings should be responsible for the disappearance of some other animal species. It is true we may【M
admin
2014-04-17
43
问题
Many people feel that human beings should be responsible for
the disappearance of some other animal species. It is true we may【M1】______
have hastened the disappearance of some species, but abundant
evidence suggests that mankind has actually had few impact Biologists【M2】______
point out that 50 species can be expected to disappear in the 20th
century but also remind us that about 50 species became extinct in the
19th century, and 50 species in each of the centuries after that Dr. T. H.【M3】______
Jukes at the University of California has pointed out that about 100
million animal species have become extinct since life began on the
earth about 3 billion years before. Thus, animals come and animals【M4】______
go as a consequence of natural selection as Mr. Darwin had invented.【M5】______
The human race is a recent newcomer to the scene, so we’ve had
nothing whatsoever to do with the disappearance of millions of species.
In fact, when it comes right down it, we’re a miserable failure【M6】______
at genocide. In spite of an all-out centuries-old war against rats, but【M7】______
we haven’t made a dent in its numbers, much less extinguished a【M8】______
single species. And in spite of all our high technology we have not
been successful on eliminating a single undesirable insect species!【M9】______
I’ve come to the conclusion that the people who are trying to
save world are probably quite sincere about it, therefore they don’t know【M10】______
much about science and certainly nothing about systems engineering.
【M4】
选项
答案
before→ago
解析
词汇错误。before和ago都表示“以前”,但before主要用于过去完成时,ago主要用于一般过去时。since引导的从句用的是一般过去时(began),所以要把before替换成ago。
转载请注明原文地址:https://kaotiyun.com/show/U1pO777K
0
专业英语八级
相关试题推荐
Itissuggestedthatuniversitiesshouldrequireeverystudenttotakeavarietyofcoursesoutsidethestudent’smajorfieldof
Undoubtedly,ourworldhaschangedalotwiththedevelopmentofscienceandtechnology.Somepeoplethinkthattechnologyhasm
TheEuropeanUnionhadapprovedanumberofgeneticallymodifiedcropsuntillate1998.Butgrowingpublicconcernovertheir
Hewasanoldmanwithawhitebeardandhugenoseandhands.Longbeforethetimeduringwhichwewillknowhim,hewasadocto
A、investmentsB、theTVlicensesC、advertisementsD、thegovernmentC
TelevisionSinceitsinventionin【1】______,【1】______televisionhasplayedanincreasinglyimportantr
TelevisionSinceitsinventionin【1】______,【1】______televisionhasplayedanincreasinglyimportantr
A、TheyexpectthatXPwillattractuserstousetheirnewproductB、TheyexpectthatXPwillenhanceAmericaneconomyC、Theyexp
Operaisexpensive:thatmuchisinevitable.Butexpensivethingsarenotinevitablytheprovinceoftherichunlessweabdicate
TheseatoftheU.S.governmentinWashingtonD,Cisknownasthe______.
随机试题
A、Theyshowfear.B、Theystarttocry.C、Theyreachout.D、Theyturntoadults.B短文说,babies看起来很怕陌生的成年人,但他们却会试图触碰陌生的baby。所以B正确。
在螺纹代号后若注明“LH”字,则是左旋螺纹,未注明的为右旋螺纹。()
无痛性间歇性肉眼血尿最常见_______。
突触后抑制与突触前抑制有何不同?
围绕受力构件内某点取出的微棱柱体的平面图如图所示,已知该点处于平面应力状态,AC面上的正应力σ=一14MPa,切应力为零,则这点的最大正应力为()。
地下连续墙施工时,泥浆的主要作用是()。
会计档案的保管期限分为定期保管和永久保管两种,具中定期保管的期限分为 ( )。
在“查找和替换”对话框的“查找内容”文本框中,设置“[!a.c]ffect”的含义是
EffectiveNote-takingThedifficultyoftakingnotes:Note-takingrequiresahighlevelofabilityduetothe【T1】______ofspoke
Dearcustomer,Bysubscribing"WildlifeMagazine"nowyouwillexperiencetheenjoymentthatcomesfromknowingwildlifeand
最新回复
(
0
)