问题 选择题

在前一种分散系中慢慢滴加后一种试剂,能观察到先沉淀后变澄清的是 [ ]

①氯化铝溶液中滴加氢氧化钠溶液②偏铝酸钠溶液中加盐酸③氢氧化钠溶液中滴加氯化铝溶液④蛋白质溶液 中滴入硫酸铜溶液⑤氯化铝溶液中滴加氨水⑥硝酸银溶液中滴加氨水⑦氢氧化铁胶体中滴加硫酸

A.①②⑥⑦

B.②③⑤⑦

C.①②④⑥

D.③④⑤⑥

答案

答案:A

阅读理解

阅读理解。

     April 27 is a special day in Britain. It's called Take Our Daughter to Work Day. It was brought to Britain

in 1994 from America. On that day thousands of girls take a day off school and go with one of their parents

to their work places. By doing this, it can teach girls more about the society where they live.

     Now the girls can have a close look at what their parents are doing. This may help them to be calmer

when they have to choose a job. Mary experienced a day of work at her mother's office. This helped her

understand her mother's work better. She said that this made her feel more confident about her future. Schools

and many companies support the activity, too. Some schools even make the day a necessary part of school

life.

     Experts think that girls with more self-confidence are more likely (可能的) to be successful than common

girls. If parents can set good examples both at work and at home for them, they will do better than others.

Take Our Daughter to Work Day is surely a step in the right direction.

1. Where was Take Our Daughter to Work Day brought?

A. From America.

B. From China.

C. From Canada.

D. From Australia.

2. On Take Our Daughter to Work Day, thousands of girls _________.

A. go on a journey with their parents

B. have a party with their friends at home

C. go to the work places of one of their parents

D. take part in a school activity freely

3. What's the advantage by doing such an activity?

A. It can help girls understand their parents' work better.

B. It can teach girls more about the society.

C. It can make girls feel more confident about their future.

D. All of the above.

4. Which of the following is NOT true about Take Our Daughter to Work Day?

A. It is a special activity on April 27 in Britain.

B. Schools and many companies support this activity.

C. Many girls like this day because they won't go to school.

D. Some schools even make the day a necessary part of school life.

5. According to the experts, being _________ is the most important to girls in their future.

A. smart and careful

B. confident

C. hard-working

D. friendly

选择题