20．After years of heated debate，gray wolves were reintroduced to Yellowstone National Park．Fourteen wolves were caught in Canada and transported to the park．By last year，the Yellowstone wolf population had grown to more than 170 wolves．
    Gray wolves once were seen here and there in the Yellowstone area and much of the continental United States，but they were gradually displaced by human development．By the 1920s，wolves had practically disappeared from the Yellowstone area．They went farther north into the deep forests of Canada，where there were fewer humans around．
   The disappearance of the wolves had many unexpected results．Deer and elk populations-major food sources （來(lái)源） for the wolf-grew rapidly．These animals consumed large amounts of vegetation （植被），which reduced plant diversity in the park．In the absence of wolves，coyote populations also grew quickly．The coyotes killed a large percentage of the park's red foxes，and completely drove away the park's beavers．
   As early as 1966，biologists asked the government to consider reintroducing wolves to Yellowstone Park．They hoped that wolves would be able to control the elk and coyote problems．Many farmers opposed the plan because they feared that wolves would kill their farm animals or pets．
    The government spent nearly 30 years coming up with a plan to reintroduce the wolvers．The U．S．Fish and Wildlife Service carefully monitors and manages the wolf packs in Yellowstone．Today，the debate continues over how well the gray wolf is fitting in at Yellowstone．Elk，deer，and coyote populations are down，while beavers and red foxes have made a comeback．The Yellowstone wolf project has been a valuable experiment to help biologists decide whether to reintroduce wolves to other parts of the country as well．
28．What is the text mainly about？D
A．Wildlife research in the United States．
B．Plant diversity in the Yellowstone area．
C．The conflict between farmers and gray wolves．
D．The reintroduction of wolves to Yellowstone Park．
29．What does the underlined word"displaced"in paragraph 2 mean？C
A．Tested．B．Separated．C．Forced out．D．Tracked down．
30．What did the disappearance of gray wolves bring about？A
A．Damage to local ecology．     B．A decline in the park's income．
C．Preservation of vegetation．  D．An increase in the variety of animals．
31．What is the author's attitude towards the Yellowstone wolf project？B
A．Doubtful．B．Positive．C．Disapproving．D．Uncaring．

分析 本文介紹了將灰狼重新引入黃石國(guó)家公園的起因結(jié)果等．政府花了近30年時(shí)間想出了重新引進(jìn)狼群的方法，如今雖然對(duì)于狼群的適應(yīng)性仍有爭(zhēng)議，但黃石公園的生態(tài)系統(tǒng)確實(shí)有所恢復(fù)，這也為生物學(xué)家以后在其他地方重新引進(jìn)狼群提供了借鑒．

解答 DCAB
28．D  主旨大意題．A項(xiàng)，"美國(guó)的野生動(dòng)物研究"．B項(xiàng)，"黃石地區(qū)的植物多樣性"．C項(xiàng)，"農(nóng)民與蒼狼之間的沖突"．D項(xiàng)，"黃石公園重新引入蒼狼"．根據(jù)文章首句  After years of heated debate，gray wolves were reintroduced to Yellowstone National Park 以及全文大意可知，本篇文章都是圍繞蒼狼被重新引入黃石公園所展開(kāi)敘述的，D項(xiàng)符合題意．A、B、C項(xiàng)都是圍繞著這個(gè)主題提及的某個(gè)方面，并沒(méi)有大篇幅描寫(xiě)，故排除．故正確答案為D．
29．C  詞義猜測(cè)題．根據(jù)文章第二段第一句 Gray wolves once were seen here and there in the Yellowstone area and much of the continental United States，but they were gradually displaced by human development 可知，在黃石地區(qū)本來(lái)蒼狼隨處可見(jiàn)，但是由于人類(lèi)文明的發(fā)展它們逐漸被迫離開(kāi)這個(gè)區(qū)域．displace 意為"取代，移走"，C項(xiàng)的 force out 意為"把…趕走，迫使離開(kāi)"，與題意相符．test 意為"測(cè)試，測(cè)驗(yàn)"，track down 意為"追尋，查獲"，均不符合題意．separate 意為"分開(kāi)，分離"，但是這里強(qiáng)調(diào)的是"被迫離開(kāi)"，不是"主動(dòng)分離"，故排除．故正確答案為C．
30．A  推理判斷題．根據(jù)第三段段意，可知蒼狼的消失會(huì)使鹿群增加，它們破壞植被，從而減少植物多樣性，破壞生態(tài)平衡．A項(xiàng)意為"破壞當(dāng)?shù)厣鷳B(tài)"，符合題意．B項(xiàng)文中未提及，排除．C項(xiàng)意為"保留植被"，與文意相反，排除．D項(xiàng)意為"動(dòng)物多樣性增多"，文中只是提到某些動(dòng)物數(shù)量增加，并未提及種類(lèi)增加，故排除．故正確答案為A．
31．B   態(tài)度判斷題．根據(jù)最后一段段意及最后一句 The Yellowstone wolf project has been a valuable experiment to help biologists decide whether to reintroducing wolves to other parts of the country as well 可知，蒼狼的引進(jìn)對(duì)黃石地區(qū)的生態(tài)平衡有很大幫助，而且這對(duì)于是否讓其他地區(qū)也引進(jìn)蒼狼具有參考價(jià)值．所以作者對(duì)于引進(jìn)蒼狼的態(tài)度是積極的（positive），B項(xiàng)符合題意．doubtful 意為"懷疑的"，disapproving 意為"不滿的，反對(duì)的"，uncaring 意為"冷漠的，不關(guān)心的"，均不符合文意．故正確答案為B．

點(diǎn)評(píng) 閱讀理解題測(cè)試考生在閱讀基礎(chǔ)上的邏輯推理能力，要求考生根據(jù)文章所述事件的邏輯關(guān)系，對(duì)未說(shuō)明的趨勢(shì)或結(jié)局作出合理的推斷；或根據(jù)作者所闡述的觀點(diǎn)理論，對(duì)文章未涉及的現(xiàn)象、事例給以解釋?zhuān)忌紫纫屑?xì)閱讀短文，完整了解信息，準(zhǔn)確把握作者觀點(diǎn)．

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