问题 填空题

形态各异的物质可按一定规律分类。现有A硫酸钠B液氧C空气D氯化钠

E冰水混合物F水银 六种物质,请选用合适的物质填空。

(1)属于混合物的是(填序号)        

(2)含有氧分子的是(填序号)        

(3)属于由离子构成的不含原子团的化合物是(填化学式)     

(4)属于氧化物的是(填化学式)       

答案

(1)C (2)BC (3)NaCl  (4)H2O

题目分析:(1)空气中含有多种气体,属于混合物,硫酸钠、液氧、氯化钠都可以用固定的化学式来表示,属于纯净物,冰水混合物是由水分子构成的,属于纯净物;(2)液氧是氧气经过低温、高压形成的液体形态,其中含有氧分子,空气中含有氧气也有氧分子,其他几个物质里的是氧原子;(3)硫酸钠由离子构成,但是含有硫酸根原子团,液氧、空气、冰水混合物中都不是由离子构成,氯化钠直接由离子构成,且不含有原子团;(4)冰水混合物由水分子构成,属于氧化物,硫酸钠不属于,因为氧化物的定义是由两种元素组成,其中一种是氧元素的化合物,硫酸钠是三种元素组成的化合物。

点评:这种类型的题目属于中考必考题型,比较基础,利用常见的物质考察学生对课本基础知识点的掌握,应重视。

单项选择题
阅读理解

阅读理解。

     When I met him, I had a lot of anger inside of me. I've lived my whole life in Spanish Harlem, but in my

neighborhood, there are shoot-ups all the time. I know kids who have been shot or beaten up. I have friends

who ended up in prison. I could have ended up that way, too, but Mr. Clark wouldn't let that happen.

     Mr. Clark worked long hours, making sure I did my work. My grades rose. In fact, the scores of our

whole class rose. One day, he took our class to see The Phantom of the Opera, and it was the first time some

kids had ever been out of Harlem. Before the show, he treated us to dinner at a restaurant and taught us not

to talk with our mouths full. We did not want to let him down.

     Mr. Clark was selected as Disney's 2000 Teacher of the Year. He said he would draw three names out of

a hat; those students would go with him to Los Angeles to get the award. But when the time came to draw

names, Mr. Clark said, "You're all going."

     On graduation day, there were a lot of tears. We didn't want his class to end. In 2001, he moved to Atlanta,

but he always kept in touch. He started giving lectures about education, and wrote a best-selling book based

on his classroom rules, The Essential 55.

     In 2003, Mr. Clark took some of us on a trip to South Africa to deliver school supplies and visit orphanages

(孤儿院). It was the most amazing experience of my life. It's now my dream to one day start a group of

women's clubs, helping people from all backgrounds.

1. Without Mr. Clark, the writer ____.

A. might have been put into prison

B. might not have won the prize

C. might have joined a women's club

D. might not have moved to Atlanta

2. The Essential 55 is ____.

A. a show

B. a speech

C. a classroom rule

D. a book

3. How many students' names were finally drawn out of a hat by Mr. Clark?

A. None.

B. Three.

C. Fifty-five.

D. All.

4. What can we learn from the passage?

A. It was in Harlem that we saw The Phantom of the Opera for the first time.

B. Mr. Clark taught us not to talk with our mouths full, and we did.

C. Mr. Clark was selected as Disney's 2000 Teacher of the Year in Los Angeles.

D. In 2003, Mr. Clark moved to Atlanta, and he always kept in touch with us.

5. In the passage, the writer intends to tell us that ____.

A. Mr. Clark went to South Africa because he liked travelling

B. Mr. Clark helped to set up a group of women's clubs

C. a good teacher can help raise his or her students' scores

D. a good teacher has a good influence on his or her students