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
2023-09-03
74
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 U. S. 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. 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. 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.
选项
A、They found ways to speed up the reproduction of bald eagles.
B、They developed new types of feed for baby bald eagles.
C、They explored new ways to hatch baby bald eagles.
D、They brought in bald eagles from Canada.
答案
D
解析
转载请注明原文地址:http://tihaiku.com/zcyy/2981433.html
相关试题推荐
【B1】[br]【B5】[originaltext]I’minterestedinthecriminaljusticesystemo
[originaltext]Helloeverybody,andWelcomebacktothethrillinggameatth
[originaltext]M:IwillbecomingstraightfromworksoI’dbetterbringanothe
[originaltext]M:IwillbecomingstraightfromworksoI’dbetterbringanothe
[originaltext]M:IwillbecomingstraightfromworksoI’dbetterbringanothe
[originaltext]M:IwillbecomingstraightfromworksoI’dbetterbringanothe
[originaltext]M:IwillbecomingstraightfromworksoI’dbetterbringanothe
[originaltext]M:IwillbecomingstraightfromworksoI’dbetterbringanothe
Almosteveryoneagreesthattheabilitytoreadandwriteshouldbeafundam
Almosteveryoneagreesthattheabilitytoreadandwriteshouldbeafundam
随机试题
Itriedhardtoputacrossmyideatohimbut___________(我所有的努力均归于无效).Whenit
Mostfishesandmanyreptileshaveribsalongmostofthespine,butinmammals
Therearecockroaches(蟑螂)everywhereonEarthexcepttheplacesthatareco
施工时,用高强度钢筋代替原设计中的纵向钢筋,正确代替原则是( )。A.受拉钢筋
从事特种作业人员必须年满()周岁。A.18 B.20 C.22 D.24
大黄酒制后能增强的作用是A.清热解毒 B.泻热通便 C.清化痰热 D.活血
下列年份中,中国人工智能专利授权量增速最快的是:A.2007年 B
按照企业采取某些措施和行动后竞争者的不同反应,可以将竞争者划分为( )。A、随机
人在每一瞬间,将心理活动选择了某些对象而忽略了另一些对象。这一特点指的是注意的(
关于农产品质量安全与恩格尔系数之间关系的说法,正确的有()。A:当恩格尔系数在
最新回复
(
0
)