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
4
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、It weakened their eggshells.
B、It poisoned their habitat.
C、It killed them directly.
D、It killed all the fish they feed on.
答案
A
解析
短文提到当秃鹰吃了被DDT毒死的鱼后,它们的蛋壳会变软,在小秃鹰孵化前就会碎掉,A中的weakened是短文中出现的原词,为正确答案。
转载请注明原文地址:https://www.tihaiku.com/zcyy/3441931.html
相关试题推荐
[originaltext]Goodafternoon,andwelcomeonceagainto"TheWorldWeNever
[originaltext]Goodafternoon,andwelcomeonceagainto"TheWorldWeNever
[originaltext]M:Goodmorning.You’reMs.Clay,right?Dositdown,please.Now
[originaltext]M:Goodmorning.You’reMs.Clay,right?Dositdown,please.Now
[originaltext]W:Goodmorning.WhatcanIdoforyou,sir?M:Goodmorning.I’v
[originaltext]W:Goodmorning.WhatcanIdoforyou,sir?M:Goodmorning.I’v
[originaltext]W:Goodmorning.WhatcanIdoforyou,sir?M:Goodmorning.I’v
[originaltext]M:I’vebeenassignedtocoverthegovernment’sspeechtoday.Wha
[originaltext]M:I’vebeenassignedtocoverthegovernment’sspeechtoday.Wha
[originaltext]M:I’vebeenassignedtocoverthegovernment’sspeechtoday.Wha
随机试题
【B1】[br]【B11】A、byB、belowC、underD、withC介词题。句意为在同一帐篷下与邻居共用灶台和洗澡设备。应选under。
Teenageboys,regardlessofrace,aremorelikelytodiefromgunshotwounds
Collagen(胶原蛋白)supplementsA)Anysoupmakerworththei
[audioFiles]audio_etoefz_031(20051)[/audioFiles]A、Shewantsthemantomakear
[A]classified[B]conducted[C]dieting[D]earlier[E]later[F]less[G]
石料的单轴压缩变形试验加载速率为()。A:0.1~0.5MPa/s B:0.
细菌性痢疾肠道病变最显著的部位是在A.升结肠 B.横结肠 C.降结肠 D.
关于新生儿窒息的叙述,正确的是A.胎儿娩出后1min仅有心跳而无呼吸,或为建立规
在计算机中1K字节表示的二进制位数是()。 A.1000 B.8×1000
某男,39岁。大便带血,血色鲜红,大便不畅,肿痛。医师诊断为痔疮,证属湿热壅遏大
最新回复
(
0
)