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、It has become extinct. B、Its number will increase continually. C、It is taken off the endangered-species list. D、It is America’
A、It has become extinct. B、Its number will increase continually. C、It is taken off the endangered-species list. D、It is America’
admin
2013-07-11
18
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 ate them up.[27]DDT caused eagle eggshells to weaken and crack. The shells became so thin that they cracked before the babies emerged from the eggs. The eagle had no defense against DDT.
Fortunately, in 1972, a law was passed to ban DDT, which saved the bald eagle from dying out. And since then, wildlife biologists have reintroduced bald eagles from Canada to America. The result was that last year U.S. birdwatchers 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.
But bald eagles still face tough times. The destruction of their natural homes could be the next DDT, causing eagle numbers to drop quickly.
26. What do we learn about the bald eagle?
27. How did DDT affect the bald eagles?
28. What has been done to prevent bald eagles from dying out?
29. According to the passage, what will cause the number of bald eagles to decline?
选项
A、It has become extinct.
B、Its number will increase continually.
C、It is taken off the endangered-species list.
D、It is America’s national symbol.
答案
D
解析
短文开头提到秃鹰是美国的国家象征,在20年前几乎濒临灭绝,故D正确。
转载请注明原文地址:https://kaotiyun.com/show/JV07777K
0
大学英语四级
相关试题推荐
A、BuyingapairofAdidastennisshoes.B、AskingherfatheraboutAdidasshoes.C、DiscussingwithherfatheraboutAdidasshoes.
FixingaWorldThatFostersObesityEnvironmentforsteringobesityWhyareAmericansgettingfatterandfatter?Thesimplee
Frenchfries,washeddownwithapintofsoda,areafavoritepartoffast-foodlunchesanddinnersformillionsofAmericanyou
Americanstodayhavedifferenteatinghabitsthantheyhadinthepast.Thereisawide【B1】______offoodavailable.Theyhavea
A、Oneofhisclassesfinishedearly.B、Hisbooksweretendaysoverdue.C、Hewantedtogetsomestudyingdone.D、Thelibraryhad
A、Exercisingtheentirebody.B、Losingweightpriortoexercise.C、Havingyourbloodpressuretaken.D、Breathingdeeplybeforee
Whenyourfamilywantstobuyorreplaceacar,atelevision,orawashingmachine,youfindthemoneyeitherfromsavingsorby
Malelionsaxeratherreservedaboutexpendingtheirenergyinhunting.Morethanthreequartersofkillsaremadebylionesses.
Wedesirethatthetourleaderimmediately______(通知我们计划中的任何变动)
Agoodmanysuggestionswereraisedbytherepresentatives,____________(正如期望的一样)
随机试题
A、 B、 C、 D、 A设F(x)=f(x)+f(-x),则F(-x)=f(-x)+f(x)=F(x),说明F(x)为偶函数,所以x[f(x)+f(-x)]为奇函数,故∫-aax[f(x)+f(-x)]
纵隔肿瘤极度衰弱
影响速动比率可信性的重要因素是()。
俾斯麦完成统一德国的主要手段是改革内政以及加强经济实力。()
我国监狱罪犯权利法律保障体系的核心是()。
某研究者进行一项以教学方法为自变量、学习成绩为因变量、智力为额外变量的实验。下列选项中,最能有效控制额外变量的方法是()
设f(x)在[a,b]上二阶可导,f(a)=f(b)=0。试证明至少存在一点ξ∈(a,b)使
Manypeopleliketotravel.Theproblemisgettingyourpettothe【C1】______.Inrecentyears,transportingpetsonflightshas
请在【答题】菜单下选择【进入考生文件夹】命令,并按照题目要求完成下面的操作。注意:以下的文件必须都保存在考生文件夹下。公司计划在“创新产品展示及说明会”会议茶歇期间,在大屏幕投影上向来宾自动播放会议的日程和主题,因此需要市场部助理小王完
SummaryListentothepassage.Forquestions26—30,completethenotesusingnomorethanthreewordsforeachblank.TheHistor
最新回复
(
0
)