首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
A、DDT made bald eagles have no fish to eat. B、DDT poisoned the water. C、DDT killed bald eagles directly. D、DDT stopped eagle egg
A、DDT made bald eagles have no fish to eat. B、DDT poisoned the water. C、DDT killed bald eagles directly. D、DDT stopped eagle egg
admin
2013-09-09
31
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、DDT made bald eagles have no fish to eat.
B、DDT poisoned the water.
C、DDT killed bald eagles directly.
D、DDT stopped eagle eggshells from hatching babies.
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/Kd07777K
0
大学英语四级
相关试题推荐
VeryfewpeopleinhistoryhaveleftarecordasclearasJohnAdams.He【C1】______asmallbookwithhimeveryday【C2】______hewr
U.S.ratesofdiseaseandsomecancers,【B1】______ofthebreast,areamongthehighestintheworld.Manyfactors【B2】______tocan
A、Becausetheydon’thavetimetowanderoffontheirown.B、Becausetheycannotspeaktheforeignlanguage.C、Becausetheyhave
Japanisgoingthroughacomplexnationalidentitycrisis.Thatmaybenobadthing,saysanewbookbyanAmericanresearcher.
A、Governmentalfund.B、Readers’payments.C、Advertisers’payments.D、Moneyprovidedbytheprivatecompanies.C
GreenWaveWashesOverMainstreamShoppingResearchinBritainhasshownthat"greenconsumers"continuetoflourishasasi
A、YoungAmericansshouldreadmoreforpleasure.B、Theretoomanynon-Englishspeakingimmigrants.C、Reformsshouldbecarriedo
A、Sheishavingaheartattack,B、Shewashurtinanaccident.C、Sheishavingababy.D、Sheissufferingfromastroke,C根据对话中“
Language,culture,andpersonalitymaybeconsidered______ofeachotherinthought,buttheyareinseparableinfact.
A、Beforefinishinghighschool.B、Afterayearortwoincollege.C、Aftergraduationfromcollege.D、Beforeenteringcollege.B[
随机试题
诊断脾破裂最有意义的检查结果是诊断胃穿孔最有价值的检查结果是
下列是治疗积滞乳食内积证的首选方剂是
导航电子地图制作标准的特点不包括()。
幼儿天生就充满了好奇,不断探索外部世界。这说明幼儿是()。
一学生决心改掉迟到的毛病,遵守学校纪律,可冬天一到,他迟迟不肯起床,结果又迟到了。对该生的教育应该培养()。
()是保证录用人民警察素质的第一道程序。
某银行的营业厅有多个柜员窗口,可以同时办理业务。银行的营业厅中安排有n张座椅供储户休息等候。每个储户在进入营业厅时会在排队机上取得一个号码,若此前没有客户,则排队机就会唤醒一个柜员为储户服务,当没有储户时柜员便可以休息。若储户较多,则所有柜员均会参与服务,
WhenDonaldOlayerenrolledinnursingschoolnineyearsago,hisfathertookithard."Here’smyfather,asteelworker,hearing
Rubidium,potassiumandcarbonarethreecommonelementsusedtodatethehistoryofEarth.Theratesofradioactivedecayoft
Fromthefirstparagraphweknowthatpresent-dayuniversitieshavebecome______.WhatdowelearnaboutSiliconValleyfromt
最新回复
(
0
)