首页
登录
职称英语
[originaltext] The bald eagle is America’s national symbol. However, the spe
[originaltext] The bald eagle is America’s national symbol. However, the spe
游客
2024-04-20
19
管理
问题
The bald eagle is America’s national symbol. However, the species almost went extinct 30 years ago, which lead lots of people into disappointment and depression. Nowadays, it has made a comeback.
(23)In fact, the U. S. 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. How did it happen?
The chief killer was the widely used DDT which is a poisonous pesticide. Fish soaked up DDT, died, and were washed up on shores, where bald eagles feasted on them.
(24)DDT prevented eagle eggshells from thickening. The shells became so thin that they shattered before the babies hatched.
Fortunately, in 1972, a law was passed to ban the use of DDT, which saved the bald eagle from total wipeout. And since then, wildlife biologists have reintroduced bald eagles from Canada to America. The result was that last year U. S. birdwatchers counted as many as 11, 610 bald eagles in the country.
However, even 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 as before.
But bald eagles still face tough times.(25)The destruction of their natural homes could be the next DDT causing eagle numbers to drop quickly.
Questions 23 to 25 are based on the passage you have just heard.
23. What is the U. S. Fish and Wildlife Service’s consideration of bald eagles right now?
24. What harmful influence does DDT have on bald eagles?
25. According to the speaker, what may be the next DDT facing bald eagles?
选项
A、It killed the bald eagles.
B、It made their eggshells thin and fragile.
C、It destroyed many of their nests.
D、It killed the baby bald eagles.
答案
B
解析
细节题。题目问DDT对秃鹰的有害影响是什么,文中有明确的信息,即秃鹰吃了身体里含有DDT的鱼,蛋壳会变薄,会容易开裂,可知选B。D选项为误导项,DDT不会直接杀害小秃鹰,只会间接地危害它们,表述不准确。
转载请注明原文地址:https://tihaiku.com/zcyy/3563134.html
相关试题推荐
[originaltext]M:Ihaven’theardfromNancysincesheenteredmedicalschool.I
[originaltext]M:Ihaven’theardfromNancysincesheenteredmedicalschool.I
[originaltext]M:Ihaven’theardfromNancysincesheenteredmedicalschool.I
[originaltext]M:Ihaven’theardfromNancysincesheenteredmedicalschool.I
[originaltext]ThreemonthsagoIflewtoBurmawithmyboyfriend,Johan.Th
[originaltext]Goodevening.YouarelisteningtoPopWorldofBCDInternati
[originaltext]VitaminDhelpsbonesandmusclesgrowstrongandhealthy.
[originaltext]VitaminDhelpsbonesandmusclesgrowstrongandhealthy.
[originaltext]VitaminDhelpsbonesandmusclesgrowstrongandhealthy.
[originaltext]M:Hi,Janet,wherewereyouatlunchtime?Iwassavingaseatf
随机试题
Accordingtotheauthor,theaccidentsaremainlycausedby______.[br]People
[audioFiles]audio_eusm_0206(20106)[/audioFiles]A、Traveltothatlibrarytoget
设n位二进制数(从00…0到11…1)中不含连续三位数字相同的数共有F(n)个,
男性,55岁,进行性吞咽困难三个月,体重下降5kg,查无阳性所见首选检查方式是A
庄园经济是一种实现农业资源集聚化、生产规模化、经营多元化、管理企业化、建设生态化
护理伦理学的基本原则不包含A.公正原则 B.行善原则 C.尊重原则 D.不
Thisrestaurant15famousforitsexcell
上海证券交易所可转换债券“债转股”通过()进行。 A.证券交易所交易系统B
A.美托洛尔 B.拉贝洛尔 C.普萘洛尔 D.比索洛尔 E.沙丁胺醇含有
某公司现有生产及维修工人850人,文职人员56人,中层与基层管理人员38人,销售
最新回复
(
0
)