首页
登录
职称英语
[originaltext] America’s national symbol, the bald eagle, almost went extinc
[originaltext] America’s national symbol, the bald eagle, almost went extinc
游客
2024-02-09
23
管理
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 en-dangered-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. 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.
16. What do we learn about the bald eagle?
17. How did DDT affect the bald eagles?
18. What has been done to prevent bald eagles from dying out?
19. According to the passage, what will cause the number of bald eagles to decline?
选项
A、DDT.
B、The disturbing of nests.
C、Hunting.
D、The destruction of their natural homes.
答案
D
解析
短文末尾指出,自然家园受到破坏可能会成为下一个“DDT”,使秃鹰的数量锐减。因此,本题选D。
转载请注明原文地址:https://tihaiku.com/zcyy/3435320.html
相关试题推荐
[originaltext]Besidesthecards,cake,candles,andgifts,theremightbeo
[originaltext]Besidesthecards,cake,candles,andgifts,theremightbeo
[originaltext]AstheMid-AutumnFestivalandNationalDayholidaysareonly
[originaltext]AstheMid-AutumnFestivalandNationalDayholidaysareonly
[originaltext]Cashorcard?It’saquestionweallfaceatthesupermarket
[originaltext]W:Whydoyouthinkyouwouldbeagoodfitforthejobasanass
[originaltext]W:Whydoyouthinkyouwouldbeagoodfitforthejobasanass
[originaltext]W:Excuseme,ProfessorSwan?MynameisCindy.(23)Ihaveanappo
[originaltext]W:Ifitishottomorrow,wemaygiveuptheideaofplayingtenn
[originaltext]W:Ifitishottomorrow,wemaygiveuptheideaofplayingtenn
随机试题
音强取决于以下哪个选项?()A.发音体振动的频率 B.发音体振动的振幅 C
党的基层组织是党在组织中的()A.战斗堡垒 B.核心集体 C.先锋队 D.
监理公司所监理的工程项目进度款的支付凭证,由下列哪位来签认?( )A.监理公司
监理方在编制工程验收监理报告时,应重点说明( )。A.工程竣工准备工作综述
试回答隔离栅工程质量检验评定标准的问题。(2)隔离栅工程质量检验评定的实测项目为
(2017年真题)国内企业境外IPO选择的主要市场不包括()。A.美国纽约
大型预应力构件、特种结构和构筑物的施工多采用()。 A、单根粗钢筋锚具方法
下列选项中最符合所给图形规律的是: A.如图所示 B.如图所示 C.如图所
(2018年真题)某二类高层建筑设有独立的机械排烟系统,该机械排烟系统的组件可不
马克思指出处于流动状态的人类劳动力或人类劳动形成价值,但本身并不是价值。它在凝固
最新回复
(
0
)