题目

实验室制取气体的思路：、、；发生装置由决定；收集装置由决定． 答案：【1】原理【2】装置【3】检验【4】反应物的状态和反应条件【5】气体的密度和溶解性．阅读理解 This is Jim's room. It's his bedroom. There is a clock on the wall. And there is a picture on the wall, too. There is a bed, a table and a desk in the room. There are four books on the desk. There are five cups on the table. What time is it now? It's two o'clock. Jim is not at home. I think he's at school. 根据短文选择正确答案： 1．There is ________ on the wall. [　　] A．a pictureB．a kite C．a clockD．a clock and a picture 2．There are ________ on the ________. [　　] A．four books, tableB．five cups, desk C．four books, deskD．five books, table 3．There's no ________ in the room. [　　] A．clockB．table C．cupsD．glasses 4．Jim is ________ at two o'clock. [　　] A．at schoolB．at home C．at workD．in bed 5．We think Jim is a ________. [　　] A．teacherB．man C．studentD．policeman