问题 解答题

某中学新建了一栋4层的教学大楼,每层楼有8间教室,进出大楼共有4道门,其中2道正门大小相同,2道侧门大小也相同,安全检查中,对4道门进行了测试:当同时开启1道正门和2 道侧门时,2分钟内可通过560名学生;当同时开启1道正门和1道侧门时,4分钟内可通过800名学生,求平均每分钟1道正门和1道侧门各可通过多少名学生。

答案

解:设平均每分钟1道正门可通过x名学生,1道侧门可通过y名学生,

由题意,得

解得

∴平均每分钟1道正门可通过120名学生,1道侧门可通过80名学生。

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I did very badly at school. My headmaster thought I was 21 and when I was 14 he said, “You’re never going to be 22 but a failure.”

After five years of 23 jobs, I fell in love with a very nice middle-class girl. It was the best24 that could have happened to me. I 25  I wanted to do something positive (积极的) with my life because I wanted to prove to26 that what people said about me was 27. Especially her mother, who had said to me, “Let’s28 it, you’ve failed at everything you’ve ever done.” So I tried hard with my29 and went to college. My first novel (小说)30 while I was at college.

After college I taught during the31 in high schools and attended evening classes at London University, where I got a 32 in history. I became a lecturer at a college and was thinking of33 that job to write full time 34 I was offered a part-time job at Leeds University. I began to feel proud of myself — 35 was a working-class boy who’d 36 school early, now teaching at the university.

My writing career (职业) took off when I discovered my own style. Now I’m rich and 37 , have been on TV, and met lots of film stars. 38 what does it mean? I39 wish all the people that have put me down had 40 : “I believe in you. You’ll succeeD.”

21.A.bright             B.useless        C.simple        D.hopeful

22.A.anything           B.something     C.everything    D.nothing

23.A.low               B.poor          C.good         D.useful

24.A.support            B.happiness      C.surprise       D.thing

25.A.admitted           B.decided        C.planned       D.told

26.A.me                B.them         C.her          D.it

27.A.wrong             B.right         C.stupid        D.faulty

28.A.see                B.know         C.understand    D.face

29.A.experiment         B.practice       C.writing       D.composition

30.A.came on            B.came in       C.came out     D.came back

31.A.day         B.night        C.month       D.year

32.A.graduation          B.pass          C.degree       D.success

33.A.giving in     B.giving back   C.giving out    D.giving up

34.A.while              B.if           C.when         D.or

35.A.there        B.here         C.it           D.that

36.A.left          B.attended            C.changed            D.graduated

37.A.tired         B.calm               C.nervous      D.famous

38.A.And         B.But                C.However     D.Well

39.A.just         B.exactly             C.so           D.very

40.A.praised    B.said C.answered D.advised