问题 选择题

将零散的化学知识控理归纳,得出一般的规律,是学好化学的可取方法之一。以下归纳中全部正确的是[ ]

A.物质的组成、结构和性质关系归纳: 

①原子的核内质子数决定了元素的种类

②元素的化学性质与原子最外层电子数目关系密切

③原子是化学变化中的最小粒子,因此在化学反应中原子不可再分

④物质是由分子、原子、离子等粒子构成的

B.物质的属类归纳:

①蔗糖、酒精、甲烷等这类含碳化合物称为有机化合物

②由金属离子和酸根离子组成的化合物称为盐

③由同种元素组成的物质称为单质

④含氧元素的化合物称为氧化物

C.实验方法归纳:

①玻璃容器都可用作反应容器

②制取气体时,应先检查装置的气密性

③加热试管里的固体或液体,先要预热

④点燃可燃性气体前必须检验气体纯度

D.物质俗称归纳:

①干冰是固态二氧化碳

②纯碱是碳酸钠

③石灰水是氢氧化钙

④天然气主要成分是甲烷

答案

答案:A

阅读理解

阅读理解。

    Rain is a Korean pop star whose real name is Jung JI-hong (郑智熏). He is famous in Asia for both his

R&B music and TV roles. His mother died of diabetes (糖尿病) six years ago. The huge sadness kept him

away from drink, night life and girls. He concentrated on performing, as his mother gave up medical care

so he could train professionally." I'm like the usual 25-year- old who wants to hang out with friends and

have a girlfriend," Rain told the New York Daily News. "But when my mother passed away, I made up my

mind that I would be the top star to honor her. I don't feel sorry for this lifestyle."

    Rain had been rejected 18 times by artistic management companies for the reason "he was too tall and

too ugly." But now he has performed in several Asian countries as well as the USA. A lot of people are

infatuated (倾倒) with Rain's music and dancing talents. In April 2006, the Time magazine named him the

second most influential (有影响的) entertainer (艺人) in the world. The future of Rain is bright.

1. From the passage we know that ______.[ ]

A. everyone thought that Rain is handsome

B. Rain worked very hard

C. rain often hangs out with friends

D. Rain has only performed in Asian countries

2. Why did Rain's mother give up her medical care? Because ______. [ ]

A. She was seriously ill

B. she had no money

C. she had no time

D. she wanted her son to train professionally

3. When did Rain decide to be the top star in the world? [ ]

A. After his mother died.

B. Before his mother died.

C. When he was very young.

D. When he was 20 years old.

4. In the second paragraph the underlined word rejected probably means ______. [ ]

A. interviewed

B. refused

C. loved

D. visited

单项选择题