有13个队参加篮球赛，比赛时先分成2个组，第一组7个队，第二组6个队，各组都进行循环比赛(即本组每一个队都要和其他队比赛一场)。然后各组的前2名共4个队进行单循环比赛，决定冠亚军，一共要比赛多少场( )
A．17
B．28
C．30
D．42
参考答案：D
解析： 根据题意，第一组7个队，每两队都要赛一场，比赛的场数是7×6÷2；第二组6个队，每两队也都赛一场，比赛的场数是6×5÷2。各组的前2名共4个队，每2队赛一场，比赛的场数是4×3÷2。一共需要比赛的场数是：7×6÷2+6×5÷2+4×3÷2＝42(场)。故本题正确答案为D。
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| Mr Black works in a hospital (医院). As a good 1 , the people in the town like him. He's often 2 to the patients (病人) and looks them over carefully. 3 he's always busy and has little time to rest. One morning Mr Black got to the hospital and saw there was a fat woman in the 4 . He called her into his office and asked," 5 . madam?" "It was my birthday yesterday, sir", said the woman. "My husband gave me a 6 . But I couldn't push my way in (挤进) it." " 7 , madam," said Mr Black. "You must lose some weght (减肥). You'll be able to 8 your coat, if you do all that I say." "You're 9 , sir," said the rich woman. "He bought me not a coat, but an expensive 10 ." |
| ( )1.A.doctor ( )2.A.bad ( )3.A.Or ( )4.A.classroom ( )5.A.How do you do ( )6.A.house ( )7.A.It doesn't matter ( )8.A.put ( )9.A.right ( )10.A.bike | B.farmer B.fine B.But B.waiting roon B.How are you B.coat B.It's a pleasure B.wear B.wrong B.bus | C.teacher C.cold C.So C.park C.What's the matter C.shop C.I have no idea C.buy C.easy C.car | D.cleaner D.kind D.Then D.zoo D.How old are you D.present D.It's my favourite D.wash D.good D.truck |