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
2023-07-10
15
管理
问题
America’s national symbol, the bald eagle, almost went extinct twenty years ago,(7)but it has made a comeback. In fact, the US Fish and Wild Life Service is considering the possibility of taking it off the Endangered Species List. Once, more than fifty thousand pairs of bald eagles nested across the country, but by 1960 that number had fallen below four hundred. The chief killer was the widely used DDT. Fish soaked up DDT, died, and were washed up on the shores, where bald eagles feasted on them.(8)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. And since then,(9)wild-life biologists have reintroduced bald eagles 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 Species List, the bald eagle would still be a threatened species. That means the bird would continue to get the same protection.(10)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.
选项
A、By neither hunting nor destroying its home.
B、By using DDT.
C、By introducing it from other countries.
D、By making the natural nests.
答案
A
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2824080.html
相关试题推荐
[originaltext]Anelderlycarpenterwasreadytoretire.Hetoldhisemploye
[originaltext]Anelderlycarpenterwasreadytoretire.Hetoldhisemploye
[originaltext]Anelderlycarpenterwasreadytoretire.Hetoldhisemploye
[originaltext]Weinterruptthisprogramtobringyouaspecialnewsbulleti
[originaltext]Weinterruptthisprogramtobringyouaspecialnewsbulleti
[originaltext]Weinterruptthisprogramtobringyouaspecialnewsbulleti
[originaltext]M:Sara,I’vebeenlookingforwardtoouryearlycampoutforthre
[originaltext]M:We’vegotthreewomenresearchersinourgroup:Mary,Bettyan
[originaltext]M:We’vegotthreewomenresearchersinourgroup:Mary,Bettyan
[originaltext]M:We’vegotthreewomenresearchersinourgroup:Mary,Bettyan
随机试题
Today,moreandmorepeopleintheUnitedStatesareusingcreditcardsinst
Itishighlydesirablethatanewpresident______forthisuniversity.A、isappo
运输transport
交通运输流
聚合酶链反应有三个基本步骤组成循环反应,它们是变性、和延伸。A.起始 B.终止
下列关于屋面涂膜防水施工,表述错误的是()。A.按先高后低原则进行 B.按涂
下列哪些工作()需要填用变电站第一种工作票的工作?220千伏断路器大修;
利用期货套期保值效果的好坏取决于()的变化。A:凸度B:基点C:久期D:基
(2015年真题)当电动机容量较大时,为降低启动电流,常用的减压启动方法有()。
女性患者29岁,产后6个月,阴道持续少量出血。近日咳嗽,痰带血丝。检查:子宫稍大
最新回复
(
0
)