题目

某县教育局为了对该区八年级数学学科教学质量进行检查，对该区八年级的学生进行摸底，为了解摸底的情况，进行了抽样调查，过程如下，请将有关问题补充完整．收集数据：随机抽取 学校与 学校的各20名学生的数学成绩（单位：分）进行分析：学校91897786713197937291 81928585958888904491学校84936669768777828588 90886788919668975988 （1） 整理、描述数据：按如下数据段整理、描述这两组数据 分段 学校 30≤x≤39 40≤x≤49 50≤x≤59 60≤x≤69 阅读下列短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项。 　　Computer programmer David Jones earns ＄35.000 a year designing new computer games．yet he cannot find a bank ready to let him have a credit card(信用卡)Instead he has been told to wait another two years until he is 18．The 16-year-old works for a small firm in Liverpool where the problem of most young people of his age is finding a job David's firm releases(推出)two new games for the fast growing computer market each month． 　　But David's biggest headache is what to do with his money．Even though he earns a lot he cannot drive a car take out a mortgage(抵押贷款), or get credit cards David got his job with the Liverpool-based company four months ago, a year after leaving school with six O-levels and working for a time in a computer shop．"I got the job because the people who run the firm knew I had already written some programs" he said David spends some of his money on records and clothes and gives his mother 50 pounds a week But most of his spare time is spent working． 　　"Unfortunately, computing was not part of our studies at school " he said "But I had been studying it in books and magazines for four years in my spare time I knew what I wanted to do and never considered staying on at school Most people in this business are fairly young, anyway" David added："I would like to earn a million and I suppose early retirement(退休)is a possibility You never know when the market might disappear．" (1) In what way is David different from people of his age? [　　] A． He often goes out with friends． B． He lives with his mother． C． He has a handsome income． D． He graduated with six O-levels． (2) What is one of the problems that David is facing now? [　　] A． He is too young to get a credit card． B． He has no time to learn driving． C． He has very little spare time． D． He will soon lose his job． (3) Why was David able to get the job in the company? [　　] A． He had done well in all his exams． B． He had written some computer programs． C． He was good at playing computer games． D． He had learnt to use computers at school． (4) Why did David decide to leave school and start working? [　　] A． He received lots of job offers． B． He was eager to help his mother． C． He lost interest in school studies． D． He wanted to earn his own living．