【名词&注释】
乙酸乙酯(ethyl acetate)、信用卡(credit card)、裸子植物(gymnosperm)、金属钠(metallic sodium)、胚未成熟、红豆杉纲(taxopsida)
[单选题]瓜类种子不可能在果实内萌发，是因为种子( )。
A. 缺乏氧气
B. 种皮太厚
C. 胚未成熟
D. 受抑制物质影响
查看答案&解析
举一反三：
[单选题]
B．work
C．school
D．hospital
A. bedB．work
B. school
C. hospital
[单选题]下列叙述错误的是
A. 乙烯和苯都能使溴水褪色，褪色的原因相同
B. 淀粉、油脂、蛋白质都能水解，但水解产物不同
C. 煤油可由石油分馏获得，可用作燃料和保存少量金属钠
D. 乙醇、乙酸、乙酸乙酯都能发生取代反应，乙酸乙酯中的少量乙酸可用饱和Na2CO3溶液除去
[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.
[单选题]现代裸子植物中最原始的类群是( )。
A. 银杏纲
B. 苏铁纲
C. 红豆杉纲(taxopsida)
D. 松柏纲
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