首页
登录
职称英语
[originaltext] America’s national symbol—the Bald Eagle—almost went extinct
[originaltext] America’s national symbol—the Bald Eagle—almost went extinct
游客
2024-05-31
2
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 feasted on them. (29)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 DDT. which saved the bald eagle from total wipeout. (30)And since then, wildlife biologists have reintroduced bald eagle eggs from Canada to America. The result was that last year US bird watchers 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. (31)But bald eagles still face tough times. The destruction of their natural homes could be the next DDT causing eagle numbers to drop quickly.
选项
A、It limited their supply of food.
B、It made their eggshells too fragile.
C、It destroyed many of their nests.
D、It killed many baby bald eagles.
答案
B
解析
事实细节题 。原文提到,DDT使得蛋壳变得很薄,在小鹰孵化之前就碎了,故本题选择B项。
转载请注明原文地址:https://tihaiku.com/zcyy/3613986.html
相关试题推荐
[originaltext]Fromthislookoutweenjoyoneofthemostspectacularviews
[originaltext]IntheUSwehavefreecompulsorypubliceducationforallch
[originaltext]W:Hey,Joe.What’sallthistalkaboutabenefitwalkathonthis
[originaltext]W:Hey,Joe.What’sallthistalkaboutabenefitwalkathonthis
[originaltext]M:Hi,Jane.Howisyourvacation?W:Terrific!IwenttoWashing
[originaltext]M:Hi,Jane.Howisyourvacation?W:Terrific!IwenttoWashing
[originaltext]Inwesternculturemusicisregardedasgoodbybirth,andso
[originaltext]Theworld’ssmartadolescenceinmathematicsandscienceare
[originaltext]Theworld’ssmartadolescenceinmathematicsandscienceare
[originaltext]Aristotle,fileGreekphilosopher,summedupthefourchiefq
随机试题
[originaltext]Spaceisadangerousplacebecauseofraysfromthesunandot
“说的是他”具有两种()A.语音停顿 B.层次结构 C.表层意义 D.深
穿“兔鞋”、戴“兔帽”是旧时天津( )的习俗。A.清明节 B.中秋节 C.
患者,女性,69岁。连续3天测血压85/50mmHg,属于A.低血压 B.正常
A.二次文献 B.三次文献 C.文摘 D.教科书 E.一次文献《医学索引
如图所示结构中,圆截面拉杆BD的直径为d,不计该杆的自重,则其横截面上的应力为:
功能破气除痞、化痰消积的药是A.青木香 B木香 C.枳实 D.陈皮
王某,48岁,建筑工人,因牙关紧闭、四肢痉挛而入院。8天前,右脚被铁钉扎伤,伤口
在内部控制良好的情况下,收到商品时,负责验收人员应当与商品进行核对的原始凭证为(
经城市规划行政主管部门批准,允许突出道路和用地红线的建筑突出物有( )。A.化
最新回复
(
0
)