题目

下列不属于有机化学范畴的是 A． 周朝设立 “酰人 ”官职负责酿造酒、醋等 B． 侯德榜用食盐生产纯碱 C． 瑞典化学家舍勒提取到酒石酸、柠檬酸等物质 D． 维勒首次在实验室里合成了尿素 答案：B【详解】 A．用含淀粉或纤维素的物质酿造酒、醋都属于有机化学范畴， A项正确； B．用食盐生产纯碱是用无机物制备无机物，不属于有机化学范畴， B项错误； C．酒石酸、柠檬酸、都是有机物， C项正确； D．尿素都是有机物， D项正确； 故选 B。Dear sir I'm a middle school student. I have something to talk with you. In my school, many students have mobile phones（手机）.They think it's cool to have a mobile phone. Really the phones come in fun colours and let students talk with their parents and friends at any time. But I don't think it's good to send messages（短信）.It takes them a lot of time to do that. Some students always hope to buy the latest mobile phones and this will waste（浪费）their parents' money. And my father tells me that most mobile phones can cause health problems. Could you do something to stop it?     Yours     Mary   1.Students use mobile phones to_________.        A. talk with their parents and friends and send messages        B. learn from others        C. study English        D. talk with their teachers   2.The students want to have the latest mobile phones. And it will_________.        A. waste their parents' time             B. waste their parents' money        C. save their time                     D. save their money  3.The writer thinks that students_________.        A. can't use a mobile phone at home      B. should use mobile phones at any time        C. must have a mobile phone at school    D. shouldn't use a mobile phone at school