首页
登录
职称英语
[originaltext][16] America’s national symbol, the bald eagle, almost went extin
[originaltext][16] America’s national symbol, the bald eagle, almost went extin
游客
2024-01-28
58
管理
问题
[16] 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. [17] 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. [18] 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. [19] The destruction of their natural homes could be the next DDT, causing eagle numbers to drop quickly.
Questions 16 to 19 are based on the passage you have just heard.
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、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
转载请注明原文地址:http://tihaiku.com/zcyy/3401044.html
相关试题推荐
[originaltext]Wereyouthefirstorthelastchildinyourfamily?Orwere
[originaltext]Wereyouthefirstorthelastchildinyourfamily?Orwere
[originaltext]Demographyisnotdestiny.Asthedebateoveraginggetsunde
[originaltext]W:Goodmorning.Dr.Smith.I’mnotsurewhetheryoucanhelpme
[originaltext]W:Goodmorning.Dr.Smith.I’mnotsurewhetheryoucanhelpme
[originaltext]W:Goodmorning.Dr.Smith.I’mnotsurewhetheryoucanhelpme
[originaltext]W:Whatagreatday,don’tyouthink?M:Iguessso.Ihadn’tn
[originaltext]W:Whatagreatday,don’tyouthink?M:Iguessso.Ihadn’tn
[originaltext]W:Whatagreatday,don’tyouthink?M:Iguessso.Ihadn’tn
[originaltext]W:Whatagreatday,don’tyouthink?M:Iguessso.Ihadn’tn
随机试题
Overthepastcentury,allkindsofunfairnessanddiscriminationhavebeen
[originaltext]M:Goodmorning!I’mcorningtoreturnthesetwobooks.W:OK,b
财务评价应在项目财务效益与费用估算的基础上进行,其分析内容应根据项目的性质和目标
B提示E处为光滑接触面约束,根据约束的性质,约束力应垂直于支撑面,指向被约束物体。
商业银行公司贷款是以企事业单位为对象发放的贷款,以下哪些属于商业银行的公司贷款?
6、变更工作负责人或增加工作任务,如工作票签发人和工作许可人无法当面办理,应通过
皮亚杰认为,儿童思维发展到一定逻辑抽象水平以后,这种思维形式适用于任何具体领域。
证券投资技术分析的内容主要包括宏观经济分析、行业分析和区域分析、公司分析等。()
对于制造企业,下列各项中属于非增值作业有()。A.迂回运送作业 B.废品
测量仪表装置宜采用垂直安装,当测量仪表装置安装在2200mm高的标准屏柜上时,下
最新回复
(
0
)