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
31
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
按照《多式联运公约》关于货物灭失或损坏的赔偿和诉讼的规定,有关多式联运的任何诉讼
喷射混凝土抗压强度试验,要求任意一组试块的抗压强度平均值,不得低于设计值()。
患儿,6个月,夜间哭闹,多汗烦躁,发稀。此时应首先添加的辅食是A.鱼泥 B.蛋
有关无痛注射,正确的叙述是A.使病人的肌肉放松 B.掌握两慢一快的方法 C.
患儿,男,7岁。发热、咽部肿痛、颈部淋巴结肿大、全身弥漫充血性针尖大小的丘疹,压
药品零售企业从事中药饮片质量管理、验收、采购人员A.应当具备执业药师资格 B.
投保施工人员团体意外伤害险的说法,不正确的是( )。A.投保人是施工企业或其他对
某发电企业在检修时,进行1号燃煤炉(主蒸汽压力30Mpa,主蒸汽温度605℃)磨
根据《公路水运工程安全生产监督管理办法》(交通部令2007年第1号),施工单位在
关于伤寒的描述,下列哪项是正确的() A.结肠形成多发性不规则溃疡 B.盲肠
最新回复
(
0
)