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
45
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
无杠杆公司明年的自由现金流量为800万元,其增长率为5%且永续,假设公司经营业务
《中图法》采用拉丁字母和阿拉伯数字相结合的混合制标记符号。()
在园林植物中,象征人品清逸和气节的是( )。A.竹 B.柏 C.莲花 D.
医患关系是以社会主义法制为保障建立起来的A.权威关系 B.信誉关系 C.互助
逐渐成为饭店主流消费群体的80后、90后的新生代顾客的消费行为具有( )特征。
听宫穴位于A.外耳道后缘 B.颧弓下缘 C.耳屏前与下颌骨髁状突后缘之间
情绪情感的联系表现在( )A.情绪和情感是同心理现象的两个不同方面 B.情绪
甲公司向乙信用社借款20万元,以甲公司现有的及将有的生产设备、原材料和产品设
某户外布置的110kV变电所,在其围墙内靠近围墙处安装有电压互感器接于线路侧,则
知识点:子宫内膜癌 女,33岁。G2P1,白带增多伴有恶臭,CA125阳性,
最新回复
(
0
)