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
2024-01-27
38
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:https://tihaiku.com/zcyy/3399982.html
相关试题推荐
[originaltext][16]America’snationalsymbol,thebaldeagle,almostwentextin
[originaltext][16]America’snationalsymbol,thebaldeagle,almostwentextin
[originaltext]WhenUSspacewomanJoanHigginbothamisnotflyingandworking
[originaltext]WhenUSspacewomanJoanHigginbothamisnotflyingandworking
[originaltext]WhenUSspacewomanJoanHigginbothamisnotflyingandworking
[originaltext]BeforeWorldWarn,wespentoursummerholidaysinHungary.
[originaltext]Mrs.Joneswasovereighty,butshestilldroveheroldcarlike
[originaltext]Mrs.Joneswasovereighty,butshestilldroveheroldcarlike
[originaltext]Theperiodofengagementisthetimebetweenthemarriagepro
[originaltext]Theperiodofengagementisthetimebetweenthemarriagepro
随机试题
Augustwasonceatimefordreaming,wanderingtheemptystreetsofthiscit
Chinesepeoplehad______8years’warwithJapanandfinallywonthewar.A、endur
[originaltext]M:Hi,Wendy.Onlytwomoreweeksofclasses,eightschooldaysa
[originaltext]W:Goodmorning,Dr.Smith.I’mnotsurewhetheryoucanhelpme
奥美拉唑特异性地作用于胃黏膜细胞,降低壁细胞中的A.H-K-ATP酶活性 B.
2010年全国房地产开发资金来源中,个人按揭贷款约占()。 A.12.
共用题干 FoodandCancerMedicalexpertshav
严禁()路使用交流断路器,直流()置应符合级差配合要求(A)直流(B)交
某配送中心为各超市提供某商品的配装服务,一个结算周期共配送礼品装商品8000件,
根据各行业生产组织的规模、产品结构以及生产经营方式的不同,其质量检验机构的设置
最新回复
(
0
)