2.Passenger pigeons(旅鴿) once flew over much of the United States in unbelievable numbers.Written accounts from the 18th and 19th centuries described flocks(群) so large that they darkened the sky for hours.
It was calculated that when its population reached its highest point,there were more than 3 billion passenger pigeons-a number equal to 24to 40percent of the total bird population in the United States,making it perhaps the most abundant bird in the world.Even as late as 1870when their numbers had already become smaller,a flock believed to be 1mile wide and 320miles (about 515kilometers) long was seen near Cincinnati.
Sadly,the abundance of passenger pigeons may have been their undoing.Where the birds were most abundant,people believed there was an ever-lasting supply and killed them by the thousands.Commercial hunters attracted them to small clearings with grain,waited until pigeons had settled to feed,then threw large nets over them,taking hundreds at a time.The birds were shipped to large cities and sold in restaurants.
By the closing decades of the 19th century,the hardwood forests where passenger pigeons nested had been damaged by Americans'need for wood,which scattered (驅(qū)散) the flocks and forced the birds to go farther north,where cold temperatures and spring storms contributed to their decline.Soon the great flocks were gone,never to be seen again.
In 1897,the state of Michigan passed a law prohibiting the killing of passenger pigeons,but by then,no sizable flocks had been seen in the state for 10years.The last confirmed wild pigeon in the United States was shot by a boy in Pike County,Ohio,in 1900.For a time,a few birds survived under human care.The last of them,known affectionately as Martha,died at the Cincinnati Zoological Garden on September 1,1914.

24.In the 18th and early 19th centuries,passenger pigeonsD.
A.were the biggest bird in the world
B.lived mainly in the south of America
C.did great harm to the natural environment
D.were the largest bird population in the US
25.The underlined word"undoing"probably refers to the pigeons'B.
A.escape           B.ruin            C.liberation             D.evolution
26.What was the main reason for people to kill passenger pigeons?C
A.To seek pleasure        B.To save other birds
C.To make money            D.To protect crops.
27.What can we infer about the law passed in Michigan?B
A.It was ignored by the public         B.It was declared too late.
C.It was unfair                        D.It was strict.

分析 文章主要講述了旅鴿的滅絕的故事,由于人們警惕意識(shí)弱,相關(guān)法律出臺(tái)太晚,最后一只旅鴿也在100年前死去.

解答 24.D.推理判斷題.根據(jù)第二段的內(nèi)容可知,據(jù)計(jì)算,旅鴿數(shù)量最多時(shí),有30多億只,相當(dāng)于美國(guó)鳥類總數(shù)的24%-40%.到1870年,旅鴿的數(shù)量已經(jīng)減少了,但是,有人在Cincinnati附近看到鴿群的規(guī)模為1英里寬,320英里長(zhǎng).由此可見,在18至19世紀(jì),旅鴿的數(shù)量最多.第一段的第二句也是關(guān)鍵信息.故選D.
25.B.詞義猜測(cè)題.根據(jù)第三段的內(nèi)容可知,旅鴿的數(shù)量巨大最終導(dǎo)致它們滅絕.undoing意為"毀滅",與ruin同義.故選B.
26.C.細(xì)節(jié)理解題.根據(jù)第三段可知,商業(yè)獵人用大網(wǎng)來圍捕旅鴿,然后運(yùn)到大城市賣給餐館,由此可見,人們捕殺旅鴿主要是為了賺錢.故選C.
27.B.推理判斷題.根據(jù)最后一段的內(nèi)容可知,1897年密歇根州出臺(tái)了法律,禁止捕殺旅鴿.那時(shí),人們已經(jīng)十年沒有看到大規(guī)模的旅鴿群出沒.由此可知,保護(hù)旅鴿的法律出臺(tái)太晚了.故選B.

點(diǎn)評(píng) 本篇閱讀理解主要考查考生對(duì)書面語(yǔ)篇的整體領(lǐng)悟能力和接受及處理具體信息的能力,學(xué)生應(yīng)該挖掘寓意,掌握中心思想,推出結(jié)論.做題時(shí)要立足于文章整體,再迅速讀一遍短文,短文中的問題和答案的設(shè)置前后都是相關(guān)聯(lián)的,有著一定的連續(xù)性,體現(xiàn)著文章的基本脈絡(luò).

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