问题 填空题

超市里为了便于顾客选购商品,往往把商品分门别类,有序摆放.在化学学习中,也需要将物质进行分类.请将下列物质按要求分类(填序号).①硫酸铜溶液②纯碱③氧气④冰水混合物⑤熟石灰⑥乙醇 其中:

(1)属于混合物的是         

(2)属于单质的是         

(3)属于有机物的是        

(4)属于碱的是          

答案

①;③;⑥;⑤

题目分析:①硫酸铜溶液由硫酸铜和水组成的混合物;②纯碱为碳酸钠的俗称,为金属与酸根组成的盐类物质,该物质虽含碳元素,但其组成、性质与无机物相似而被归为无机物;③氧气是氧元素组成的纯净物,属于单质;④冰为固态的水,因此冰水混合物为一种物质水组成的纯净物,该物质由氢、氧两种元素组成,属于氧化物;⑤熟石灰为氢氧化钙的俗称,由钙离子与氢氧根离子组成,属于碱类物质;⑥乙醇由碳、氢、氧三种元素组成的化合物,属于有机物;

因此属于混合物的为硫酸铜溶液;属于单质的为氧气;属于有机物的为乙醇;属于碱的为熟石灰;

点评:本题主要考查物质分类的知识,解答时要分析物质的组成,再根据物质分类的概念分析、判断,从而得出正确的结论.

完形填空

第二节  完形填空(共20小题;每小题1.5分,满分30分)

阅读下面短文,从短文后各题所给的四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。

Yesenia is a brave and nice person who has passed challenges in her life. And learning from

the past always makes her a focused person. Are you _____21_____ to know more about hts mysterious girl? Then let’s get started here.

First, her life was ______22______ for a girl of her age at that time because her childhood wasn’t as ______23_______ as other girls. It _______24________ with the death of her grandmother with whom she had a great relationship. Then, when she was eight years old, her ______25____ left because he had a fight with her mother over another woman. So she didn’t have a _____26____ family to raise her.

But, ______27______ time passed, she forgot her sadness and became the same girl again. After that, she had a(n) ________28_________ when she was in her grandmother’s house. It ______29_______ when she was playing with a lighted candle, and _______30______, the candle fell onto the table. The tablecloth caught fire and the flames ________31_______ her on the chest and on the arm.

No matter what happened, however, she continued to _______32______ in school. She graduated from school in 2000 and got the _______33_______she had expected. Then, she moved to America for ______34_______ study. English was very _____35____ for her because she had never studied it before. _____36_____, she worked as a volunteer in a hospital because she didn’t want to see people _____37_____ from accidents. This experience _____38_____ her braver.

Yesenia is a girl who has experienced ___39______ sufferings in her life but who I think will be happy in the USA and she really ______40______ it.

21. A. confused           B. serious          C. curious          D. tired

22. A. difficult            B. lucky               C. dull             D. disappointing

23. A. happy             B. equal                C. real             D. surprising

24. A. ended              B. started              C. combined         D. mixed

25. A. grandfather          B. sister               C. brother           D. father

26. A. complete            B. big                 C. modern           D. comfortable

27. A. after                B. as                 C. since              D. for

28. A. story                B. experience          C. accident          D. lesson

29. A. showed up           B. appeared            C. happened         D. took place

30. A. unacceptably         B. undoubtedly          C. unnaturally       D. unfortunately

31. A. hit                  B. exploded              C. spread           D. burned

32. A. live                 B. work                C. study            D. calm

33. A. prize                B. diploma              C. reward           D. praise

34. A. farther              B. further               C. farthest          D. furthest

35. A. difficult             B. pleasant              C.  easy           D. popular

36. A. However            B. Thus                  C. Also             D. Therefore

37. A. benefit              B. suffer                C. lose              D. recover

38. A. kept                B. made                C. forced            D. drove

39. A. many               B. little                 C. few              D. much

40. A. satisfies             B. catches               C. suits              D. deserves

名词解释