r=2厘米（注明圆心、直径和半径）．

达尔文根据多年的观察和研究，认为家养生物新品种的形成是长期的______结果，而自然界中新物种的形成是长期______的结果，即通过激烈的生存斗争，______生存，并能繁殖后代，______被逐渐淘汰掉．

信息匹配首先，请阅读以下有关音乐会的信息。

     A. Raymond's Solo Concert: Raymond, the talented singer who shifts freely between musical, folk songs

and hip hop, is to give a solo concert this weekend. The event will be part of the Asian tour promoting his new

album. His concert has very high ticket prices, but his fans have bought tickets worth one million yuan in just

four days. (Place: Grand Theatre; Time: 8:30 - 10:30 pm, January 6; Price: 380 - 2,000 yuan)

     B. Prince of the Piano: Clayderman has established a truly international career as a best selling recording

artist and concert performer. (Place: The Great Hall of the People; Time: 8:00 - 10:00 pm, January 7;

Price: 180 - 1680 yuan)

    C. Live Music: Audiences in the city will be able to make a date with one of the most famous German

Orchestras on the evening of Jan. 27 at Century Center. Conducted by Florian Stubenvoll, the orchestra will

perform 11 classics including Beethoven's"Fledermaus Ouverture," Mozart's "Symphony No. 40". (Place:

Century Theatre; Time: 8:00 - 10:30 pm, January 10; Price: 120 - 680 yuan)

     D. Jazz Night: Enjoy real American jazz from Herbie Brown, the famous trumpet player. Herbie is known

to play well into the early hours, so don't expect to get much sleep. Get your tickets quickly. (Place: The Jazz

Club; Time: 10:00 pm till late January 7, 9, 11; Price: 100 - 200 yuan)

     E. Scottish Dancing: Want to get your body some exercise while enjoying live music? Take your partner

here and get ready to dance till you drop. Scottish dancing is fun and easy to learn. There will be instructors

demonstrating the dances. The live band is also excellent. (Place: Jack Stein's; Time: 7:30 - 10:00 pm, January

5 - 7; Price: 70 yuan including one drink)

      F. Beijing Rocks:"The Night of Chinese Rock" is set to bring rock fans special performance. Eight Chinese

rock bands will perform at the concert, including older generation bands, middle generation and some recent

arrivals. The audience can even decide what songs they want to hear, which is sure to bring a storm. (Place:

Worker's Stadium; Time: 8:00 - 11:30 pm, January 4 ; Price: 60 - 180 yuan)

请阅读以下观众的信息,然后匹配与其适合的音乐会。

     1. Sally enjoys listening to foreign music in her spare time. She would like to attend concerts performed

by foreign bands or orchestras whenever it's possible. But according to the school rules, she has to return to

her dormitory before 11:00 pm.

     2. Joey and his friends always enjoy their weekend by attending late night activities. But he has been

working for a couple of weeks. This weekend he wants to have fun with his friends, who are interested in

Jazz.

     3. Alice is a college student who studies music, and playing the piano is her favorite. Her parents approve

of her attending concerts and pay for the tickets. As a result, she doesn't care about how much th e ticket

might cost.

     4. Mike and his girlfriend are both university students. The coming Sunday (January 6) is his girlfriend's

birthday. As both of them are music fans, they would like to enjoy some live music and learn new dancing.

     5. Tracy is interested in a variety of music, especially, rocks. Like most of the other university students,

she has a part-time job. Since she does not earn much, she can only afford a ticket that costs no more than

100 yuan.

一般情况下〃异常类存放在什么命名空间中＜（）。

A.生成异常类所在的命名空间

B.System.Exception命名空间

C.System.Diagnostics命名空间

D.System命名空间

发动机汽缸体平面变形较大时应采取（）。

A.磨削法修复

B.铲削法修复

C.研磨法修复

什么叫动稳定？