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
40
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://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
Competitionintheearlymovieindustrywas【B1】______.Toforcetheircompeti
Mineraldeficienciescanoftenbedetectedbyspecificsymptomssuchaschlo
Whendoesaneutronfromoneatomcollideswiththenucleusofanotheratom,ac
WhatisAustraliasufferingfromatpresentaccordingtothepassage?[br][ori
AccordingtoBowlby,childrenundertheageofthree______.[br]Thephrase"day
一个程序的控制流图中有6个节点,10条边,在测试用例数最少的情况下,确保程序中每
王某购买了A公司股票,由于做生意急需资金,王某将股票出售而非要求退股,不能要求退
案例三 案例介绍:一位32岁的妈妈为儿子的问题前来咨询。下面是一段咨询谈话:心
患者,女性,29岁,左下后牙床肿痛伴左下颌角区肿胀4天。检查:体温38.4℃,开
某批发市场目前财务部门正在编制2013年12月份的预算,有关资料如下: (1)
最新回复
(
0
)