There are different 1of animals in the zoo. We can see the zoo keepers (饲养员) give them food to 2. They don't have to 3 food by themselves. They just eat, walk and sleep 4 day. So many of us think the animals in the zoo are 5 and lucky. But most of them are sad. Why? They are no longer free.

    Animals 6 elephants, monkeys and tigers usually live freely and happily 7 forests (森林) or mountains. Tigers, for 8, run, jump, play 9 their children and catch small animals for food. But now they have to stay in small cages in the zoo. Their life in the zoo is quite different from their life in the forests. Now many people think more animals should go 10 to forests and mountains so that they become free and happy again.

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Music

    Opera at Music Hall: 1243 Elm Street. The season runs June through August, with additional performances in March and September. The Opera honors Enjoy the Arts membership discounts. Phone: 241-2742. http://www. cityopera.com.

    Chamber Orchestra: The orchestra plays at Memorial Hall at 1406 Elm Street, which offers several concerts from March through June. Call 723-1182 for more information. http://www.chamberorch.com.

    Symphony Orchestra: At Music Hall and Riverbend. For ticket sales, call 381-3300. Regular season runs September through May at Music Hall and in summer at Riverbend. http://symphony.org/home.asp

    College Conservatory of Music (CCM): Performances are on the main campus (校园) of the university, usually at Patricia Cobbett Theater. CCM organizes a variety of events, including performances by the well-known LaSalle Quartet, CCM's Philharmonic Orchestra, and various groups of musicians presenting Baroque through modern music. Students with I.D. cards can attend the events for free. A free schedule of events for each term is available by calling the box office at 556-4183. http://www.ccm.uc.edu/events/calendar.

    Riverbend Music Theater: 6295 Kellogg Ave. Large outdoor theater with the closest seats under cover (price difference). Big name shows all summer long! Phone: 232-6220. http://www.riverbendmusic.com.

根据短文内容，选择最佳答案，并将选定答案的字母标号填在题前括号内。

孟德尔获得成功的原因有 (    )
①正确选用豌豆作为实验材料；②研究时采用单因素到多因素的方法；③用统计学方法分析实验结果；④科学地设计了试验程序。

唐朝被称为“诗仙”、“诗圣”的是（    ）

①李白②阎立本③杜甫④白居易