鉴意义。

　　1．What is the text mainly about?

　　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.

　　D　[主旨大意题。文章围绕重新将灰狼引入黄石公园展开讨论，故选D项。

　　A项"美国的野生生物调查"过于宽泛；B项"黄石地区的植物种类"与主题不符；C项"农场主和灰狼之间的冲突"以偏概全。]

　　2．What does the underlined word"displaced"in Paragraph 2 mean?

　　A．Tested.　　　 B．Separated.

　　C．Forced out. D．Tracked down.

　　C　[词义猜测题。根据上文可知，灰狼曾经随处可见，再结合后文wolves had practically disappeared可知与displaced意思最接近的是C项"封杀出局，消灭掉"。displace意为"取代，替代"。

　　test测试；separate分开；track down追查到，均与语境不符。]

　　3．What did the disappearance of gray wolves bring about?

　　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.

　　A　[推理判断题。由第三段可知，灰狼的消失产生了很多意想不到的结果。鹿群及丛林狼的数量快速增长，前者导致植被破坏，后者杀死大量红狐狸并将河狸赶出公园。由此可知，灰狼的消失导致当地的生态失去平衡，故选A项。

B项"公园收入下降"，无中生有；C项"植被保护"及D项"动物种类增加"均与原文相悖。]