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
2023-06-26
57
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、It has become extinct.
B、Its number will increase continually.
C、It is taken off the endangered-species list.
D、It is America’s national symbol.
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2783714.html
相关试题推荐
[originaltext][23]Thetouristindustrydiffersfrommanyothersinthatit
[originaltext][23]Thetouristindustrydiffersfrommanyothersinthatit
[originaltext]Areyousometimesalittletiredandsleepyintheearlyafte
[originaltext]Areyousometimesalittletiredandsleepyintheearlyafte
[originaltext]Whilemostpeoplewerewarminguptheircars,[16]Bruce,myh
[originaltext]W:Bob,willyoutellmesomethingaboutthenewintelligenthous
[originaltext]W:Bob,willyoutellmesomethingaboutthenewintelligenthous
[originaltext]M:Weseemtobehavingthisconversationoverandoveragain.W:
[originaltext]TheofficialOlympiccheerleadersarealotdifferentthanwh
[originaltext]TheofficialOlympiccheerleadersarealotdifferentthanwh
随机试题
Manypeoplewholiveincitiessaythattheydislikecitylife.Theysaythe
Despitetheirmanydifferencesoftemperamentandofliteraryperspective,E
TheDodgeBrothersA)Itwas100yearsagothisweektha
监理人在行使某项权力前需要经发包人事先批准而通用合同条款没有指明的,应在(
“解决一些特定的社会问题,包括完成一项具体的工作,满足社区需要”指的是社区工作的
一般资料:求助者,男性,26岁,硕士研究生。 求助者主述:近一年来焦虑、紧张,
边际产量递减规律发生作用的前提条件是()。A.投入的生产要素价格不变 B.各种
关于企业财务会计报告编制要求的说法,错误的是()。A.财务会计报告的格式和内容可
甲公司是C国一家以乳制品业务为主体的多元化经营企业,业务范围涉及乳制品、煤
隧道监控量测中,属于必测项目的是()。A.围岩体内位移 B.钢支撑内力及外力
最新回复
(
0
)