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、Pollution of the environment. B、A new generation of pest killers. C、Over-killing by hunters. D、Destruction of their natural ho
A、Pollution of the environment. B、A new generation of pest killers. C、Over-killing by hunters. D、Destruction of their natural ho
admin
2010-12-04
34
问题
America’s national symbol--the Bald Eagle--almost went extinct 20 years ago. But it has made a comeback. In fact, the US Fish and Wildlife Service is considering the possibility of taking it off the endangered species list. Once, more than 50 000 pairs of bald eagles nested across the country. But by 1960, that number had fallen below 400. The chief killer was the widely used DDT. Fish soaked up DDT died and were washed up on shores where bald eagles feasted on them. (29)DDT prevented eagle eggshells from thickening. The shells became so thin that they shattered before the babies hatched. Fortunately, in 1972, a law was passed to ban DDT, which saved the bald eagle from total wipeout. (30)And since then, wildlife biologists have reintroduced bald eagle eggs from Canada to America. The result was that last year US bird watchers counted 11 610 bald eagles in the country. If it were dropped from the endangered list, the bald eagle would still be a threatened species. That means the bird would continue to get the same protection--no hunting allowed, and no disturbing of nests. (31 ) But bald eagles still face tough times. The destruction of their natural homes could be the next DDT causing eagle numbers to drop quickly.
选项
A、Pollution of the environment.
B、A new generation of pest killers.
C、Over-killing by hunters.
D、Destruction of their natural homes.
答案
D
解析
事实细节题。短文结尾部分明确指出秃鹰依旧面临着困境,自然家园的毁坏会使它们的数量迅速减少,故答案为D)。
转载请注明原文地址:https://kaotiyun.com/show/s4s7777K
0
大学英语六级
相关试题推荐
Thereisvirtuallynolimittohowonecanservecommunityinterests,fromspendingafewhoursaweekwithsomecharitableorga
TheSeattleTimesCompanyisonenewspaperfirmthathasrecognizedtheneedforchangeanddonesomethingaboutit.Inthenews
A、Thedevelopmentofourabilitytocheckthedetails.B、Matchingourexpectationswiththemeaningofatext.C、Theapplication
Bookshavealwaysbeenthemaintoolsforteaching.Butavastnumberofnewtoolshavecometouseinthis【S1】__
Whensome19thNewYorkerssaid"Harlem",theymeantalmostallofManhattanabove86thStreet.Towardtheendofthecentury,h
OneofLondonZoo’srecentadvertisementscausedmesomeirritation,sopatentlydiditdistortreality.Headlined"Withoutzoos
Fromaworldofsilence,deafpercussionistEvelynGlenniebroughtsomeoftheworld’smostbeautifulmusictothechurchofSt.
Airpollutionisoneofthemostpervasiveenvironmentalproblemsbecauseatmosphericcurrentscancarrycontaminatedairtoeve
Thetragicimpactofthemoderncityonthehumanbeinghaskilledhissenseofaesthetics,thematerialbenefitsofawealthys
随机试题
Don’t______yourbooksonthefloor.
日本血吸虫病传播途径中最重要的环节是
下列腧穴在五行配属中,属金的是
临时用电安全技术档案应由()建立与管理。
游客患重病需做手术,如果亲属不在,应由()同意并签字。
杨老师在运用自己编制的试卷组织测验时发现,优等生和后进生的得分没有拉开差距,这说明杨老师的试卷()。
()是我国第一部长篇历史章回小说。
“那一位”是量词短语。()
阅读以下说明和Java代码,将应填入(n)处的字句写在对应栏内。【说明】下面代码里,instr是一个抽象类,它被两个子类wind和rain分别实现,而brass又继承了wind类,并覆盖了play方法。【程序】(1)
Whatisthepurposeoftheadvertisement?
最新回复
(
0
)