问题 填空题

“水是生命之源.”鉴别硬水和软水可用______,生活中软化硬水常用的方法是______,除去水中可溶性杂质和异味可用______吸附,为减少水的污染可采取的有效措施之一是______.

答案

检验水是硬水还是软水可用肥皂水,在等量的水样中分别加入等量的肥皂水振荡,泡沫多的是饮用纯净水,泡沫少的是硬水;硬水是含有较多可溶性的钙、镁化合物的水,主要是碳酸氢钙和碳酸氢,前者加热分解能生成不溶的碳酸钙而沉淀下来,后者最终能生成不溶的氢氧化镁而沉淀下来,故生活中使硬水软化的一种常用方法是煮沸.

活性炭具有吸附作用,可以吸附色素和异味.

水污染的途径是:生活污水和工业废水的任意排放,农业上化肥、农药的过量使用.所以生活污水、工业废水处理达标后排放,合理使用农药、化肥,都可以减少水的污染.

故答案为:肥皂水;煮沸;活性炭;生活污水处理达标后排放.

阅读理解

No one wants to look silly or do the wrong thing at a new job. It’s important to make the right impression (印象) from the first day. You will face new people. You will be in a new place. It may be difficult to know what to do. Here are seven tips to help you make it through the first days at a new job:

1. First impression is important. Make sure you make a good one. Before your first day, find out if your new job has a dress code. If so, be sure to follow it. No matter what you wear, always be neat (整洁) and clean.

2. Get to work on time. Employers value workers who come to work on time. Give yourself an extra 15 minutes to make sure you arrive on time.

3. Pay attention to introduction. One of the first things that your supervisor (主管) may do is to introduce you to co-workers. These co-workers will be important to you. They are the ones who will answer your questions when the boss isn’t around.

4. Ask plenty of questions. Make sure that your supervisor has told you what your are expected to do. If he or she has not told you your job duties, ask for a list. Set daily and weekly goals for yourself.

5. Don't make personal phone calls. You should never make personal phone calls to your friends and family unless it's an emergency.

6. Don’t take too long for lunch. What’s the lunch-hour policy at your new job? You can find out from your supervisor or your company’s personnel department(人事部门). For example, do people eat at their desks or does everyone take a full hour outside the workplace?

7. Never be the first one to leave. Observe how your co-workers behave around quitting (离开) time. It does no good for you to be eager to leave.

小题1:Which is the best title for the passage?

A.Tips On First Days At a New Job

B.How to Do a Job Well

C.Be the Last to Leave

D.Ways to Find a New Job小题2:From the last two paragraphs, we can infer that the most important rule we should follow is ______.

A.to have lunch outside the workplace

B.to do as other people do

C.not to be the first to leave after work

D.to pay attention to introductions小题3:The underlined phrase “a dress code” (Para. 2) means ______.

A.a beautiful dress

B.a place where a dress can be placed

C.a neat and clean dress

D.a rule about what you can wear to work小题4:Which of the following is NOT true according to the passage?

A.You should not make personal calls unless very necessary.

B.Co-workers will be important to you when the boss is out.

C.You shouldn’t ask any questions in case you trouble others.

D.Leave an extra 15 minutes earlier to make sure you won’t be late.

单项选择题