【名词&注释】
半导体(semiconductor)、水处理(water treatment)、消毒剂(disinfectant)、信用卡(credit card)、离子半径(ionic radius)、特大城市(megalopolis)、土壤条件(soil condition)、电子层结构(electron structure)、公路立交桥(highway overpass)
[单选题]有X、Y、Z、W、M五种短周期元素，其中X、Y、Z、W同周期， Z、M同主族； X+与M2－具有相同的电子层结构(electron structure)；离子半径：Z2－＞W－；Y的单质晶体熔点高、硬度大，是一种重要的半导体材料。下列说法中，正确的是
A. X、M两种元素只能形成X2M型化合物
B. 由于W、Z、M元素的氢气化物相对分子质量依次减小，所以其沸点依次降低
C. 元素Y、Z、W的单质晶体属于同种类型的晶体
D. 元素W和M的某些单质可作为水处理中的消毒剂
查看答案&解析
举一反三：
[单选题]与广东某特大城市相比，北京城市公路立交桥(highway overpass)的设计坡度较小，主要考虑的自然因素是
A. 地质条件
B. 水文条件
C. 土壤条件(soil condition)
D. 气候条件
[单选题]根据下面内容，回答 60 ~63 题： BComputer 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
A. 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.
B. “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：“l would like to earn a million and I suppose early retirement(退休)is a possibility．You never know when the market might disappear．”
C. 第5题：In what way is David different from people of his age?
D. He often goes out with friends.
E. He lives with his mother.
F. He has a handsome income.
G. He graduated：with six O-levels.
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