问题 填空题

从C、H、O、N、S、P、Na、Ca、Fe、Mn、K、Cu等12种元素中选择恰当的元素,用离子符号、化学式或化学方程式按下列要求填空:

(1)铵根离子_________;磷酸氢钙中的阴离子________;能造成温室效应的气体单质________;红色颜料铁红的主要成分________;有毒的工业用盐亚硝酸钠________。

(2)细铁丝在氧气中燃烧_______________________。

(3)实验室加热紫黑色晶体制取氧气______________________。

(4)除去硫酸亚铁溶液中的硫酸铜______________。

(5)乙醇燃烧__________________。

答案

(1)NH4+;HPO42-;O3;Fe2O3;NaNO2

(2)3Fe+2O2Fe3O4

(3)2KMnO4K2MnO4+MnO2+O2

(4)Fe+CuSO4==FeSO4+Cu

(5)C2H5OH+3O22CO2+3H2O

单项选择题
完形填空

Ⅱ 语言知识及应用(共两节,满分35分)

第一节:完形填空(共10小题,每小题2分,满分20分)

阅读下面短文,掌握其大意,然后从21~30各题所给的四个选项(A、B、C和D)中,选出最佳选项,并在答题卡上将该项涂黑。

When television first began to expand, very few of the people who had become famous as   21  announcers were able to be equally effective on television. Some of the difficulties they experienced when they were trying to   22 themselves to the new medium were technical. When   23   on radio, for example, they had become   24  to seeing on behalf of the listener. This art of seeing for others   25   that be announcer has to be very good at talking. In the case of television, however the announcer sees   26   with the viewer. His duty,  27  , is completely different. He is there to make sure that the viewer does not   28  any point of interest, to help him focus on particular things, and to help him   29   the images on the television screen.  30  his radio colleague, he must know the value of silence and how to use it at those moments when the pictures speak for himself.

21. A.television       B.advertisement   C.radio         D.newspaper

22. A.adopt         B.adjust          C.change         D.shape

23. A.working     B.listening      C.appearing     D.showing

24. A.practiced     B.experienced      C.determined       D.used

25. A.guarantees      B.means          C.convinces     D.warns

26. A.something      B.Everything   C.nothing        D.anything

27. A.Moreover   B.therefore      C.furthermore     D.nevertheless

28. A.miss          B.ignore         C.drop         D.catch

29. A.reveal        B.expose         C.understand       D.translate

30. A.Like       B.    Beside             C.Unlike         D.As