题目

“宏观—微观—符号”之间建立联系，是化学学科特有的思维方式，工业上生产尿素 [CO(NH2)2]的微观示意图如下所示，根据图示信息分析不正确的是A. 反应的化学方程式为：2NH3 + CO2 CO(NH2)2 + H2OB. 反应物和生成物都是由分子构成C. 反应前后分子和原子的种类都发生改变D. 反应物和生成物中各有一种氧化物 答案：【答案】C【解析】由微观反应示意图可知，氨气和二氧化碳在一定条件下能反应生成尿素和水，方程式是：。A．由上述分析可知，反应的化学方程式为：，故正确；B．由微观反应示意图可知，图中的四种物质均是由分子构成的，故正确；C．由微粒的变化可知，反应前后分子的种类发生了改变，原子的 阅读理解。 　　In many English homes people eat four meals a day．They have breakfast at any time from seven to nine in the morning．They eat porridge(粥),eggs or bread and drink tea or coffee at breakfast．Lunch comes at one o'clock．Afternoon tea is from four to five in the afternoon and dinner is about half past seven．First they have soup,and then they have meat or fish with vegetables．After that they eat some other things,like bananas,apples or oranges．But not all English people eat like that．Some of them have their dinner in the middle of the day．Their meals are breakfast,dinner,tea and supper and all these meals are very simple． (1) Many English people have________meals a day． [　　] A． two B． three C． four D． five (2) People may have________for their breakfast according to the passage． [　　] A． tea and eggs B． hamburgers and tea C． coffee and salad D． eggs and fish (3) People have lunch at ________． [　　] A． any time B． nine C． five D． one (4) People don't have ________for their dinner． [　　] A． bananas and apples B． soup and meat C． meat and fish D． porridge (5) Most Englishmen have dinner． [　　] A． at one B． at any time C． at noon D． in the evening