捐____      稞____

绢____      颗____

祥____      梳____

详____      疏____

①2MnSO₄+4KOH+O₂→2MnO（OH）₂+2K₂SO₄；

②MnO（OH）₂+2KI+2H₂SO₄→I₂+MnSO₄+K₂SO₄+3H₂O；

③I₂+2Na₂S₂O₃→2NaI+Na₂S₄O₆

该样品中溶解氧量为（          ）

北京是我国的____中心、文化中心和国际交往中心；____是我国最大的城市，也是我国最重要的综合性工业城市．

从右栏中选出与左栏相应的答句。

①Is this your school?____                                                            A.There are three.

②How is your brother, Tom?____                                                B.I'm a student.

③Is there an art room in your school?____                                 C. She's Jack's sister.

④What are you?____                                                                    D. Yes, it is.

⑤How old is he?____                                                                    E. No, there aren't.

⑥Is Mrs. Li a teacher?____                                                            F. Thank you very much.

⑦Are there five boxes on the desk?____                                    G. He's fine.

⑧How many rubbers are there in th edesk?____                       H. Yes, there is.

⑨Sit down, please.____                                                                I. No, she isn't.

⑩Who's she?____                                                                       J. He's twelve.