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
2024-02-11
4
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 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、Reintroduce them from Europe.
B、Make a ban on killing them.
C、Feed them on uncontaminated fish.
D、Pass a law to ban DDT.
答案
D
解析
短文提到在1972年,美国立法禁止使用了DDT,使秃鹰免于绝种,D“通过一项禁止使用DDT的法律”与此相符,故为正确答案。
转载请注明原文地址:https://www.tihaiku.com/zcyy/3441932.html
相关试题推荐
[originaltext]Insportsthesexesareseparate.Womenandmendonotrunorswi
[originaltext]Insportsthesexesareseparate.Womenandmendonotrunorswi
[originaltext]Inherearlydaysasanemergencyroomphysician,DoctorJoan
[originaltext]Inherearlydaysasanemergencyroomphysician,DoctorJoan
[originaltext]Inherearlydaysasanemergencyroomphysician,DoctorJoan
[originaltext]Wednesdaysarethemostdepressingdayoftheweek.(30)Ify
[originaltext]W:Dad!M:Yes?What’sthematter,Joyce?W:I’mwonderingifIs
[originaltext]W:Sir,you’yebeenusingtheonlinecatalogueforquiteawhile
[originaltext]W:Sir,you’yebeenusingtheonlinecatalogueforquiteawhile
[originaltext]W:Haveyouheardofthenewfitnesscentrethey’rebuildingdown
随机试题
[originaltext]M:Iwentoutwithmygirlfriendtoanicerestaurantlastnight
[originaltext]W:Ijustmadeupaquartoforangejuicethismorning,andnowI
PeopleworldwidecelebrateNewYearindifferentways.InLatinAmerica,peo
Ineveryeconomicsystem,entrepreneursandmanagersbringtogethernatural
动脉瘤进行血管造影检查时,宜采用的方法是A.经骨髓穿刺造影 B.经静脉注射造影
保卫细胞侧面观呈哑铃形或电话听筒形是下列哪项药材的显微鉴别A.薄荷B.桑寄生C.
根据民法总则规定,下列行为中,因当事人无民事行为能力而无效的有()。[2019年
消费者购买房地产后主要用来出租以获得回报,这种对房地产的需求称为()。A.自用
能滋肾养阴、益气生津,主治气阴两虚所致的消渴病、消瘦乏力、眠差、腰痛的中成药是A
(2020年真题)福费廷(FORFEIT)作为一种专门的代理融资技术,其本质是以
最新回复
(
0
)