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
2023-07-10
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 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、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:http://tihaiku.com/zcyy/2825667.html
相关试题推荐
[originaltext]TheWorldHealthOrganizationistocallforstrictcontrols
[originaltext]TheWorldHealthOrganizationistocallforstrictcontrols
[originaltext]Thereareover3,000languagesthatareusedthroughoutthew
[originaltext]Somepeoplehavethefeelingthatnothingcanbedoneabouttheir
[originaltext]Somepeoplehavethefeelingthatnothingcanbedoneabouttheir
[originaltext]W:SteveinwhichyeardidyoucometoJapan?M:Uh,letmesee,
[originaltext]W:SteveinwhichyeardidyoucometoJapan?M:Uh,letmesee,
[originaltext]W:SteveinwhichyeardidyoucometoJapan?M:Uh,letmesee,
[originaltext]Asignificanteffortwillbewagedthisyeartobringmorest
[originaltext]Asignificanteffortwillbewagedthisyeartobringmorest
随机试题
Certainlynocreatureintheseaisodderthanthecommonseacucumber.Alllivi
AsIponderwhomitmightbethatIwouldconsiderarolemodel,Irealized
[originaltext]W:Goodmorning.TotalInsurance.Judyspeaking,howmayIhelpy
人体主要的热能来源是A.脂肪乳 B.氨基酸 C.果糖 D.维生素 E.葡
下列属于临时工程的有()。A.工作便道 B.汽车便道 C.电力支线
共用题干 刘某2011年购得一商铺,以每月2000元的租金租给吴某,租期5年.
严重Ⅱ型呼吸衰竭不宜高浓度给氧的原因A.可引起氧中毒 B.缺氧不是主要原因
患者,男,65岁,农民,小学文化。胃癌术后第1天,护士就减轻术后疼痛的方法与其进
变电站基建工程设备厂内验收关键点见证前期应做好的工作包括:了解设备的技术要求,包
如双方未对纠纷的解决方法进行约定,或事后无法达成一致的解决方法,则通过人民法院进
最新回复
(
0
)