问题 实验题

(8分)中学课本中常见的几种气体:①O2②H2③CO2④Cl2⑤H2S ⑥SO2⑦NH3都要求掌握其实验室制法。根据所学知识回答有关问题(填气体编号)

(1)能用启普发生器制备的气体有                

(2)能用浓H2SO4干燥的气体有                   

(3)能用碱石灰干燥的气体有                         

(4)收集气体的方法常有:排水法、向上排空气法和向下排空气法。如下图,用仪器A、B和橡胶管组成装置收集NO气体(①仪器A已经气密性检查;②除水外,不能选用其它试剂)正确的操作步骤是         

答案

(每小题2分,共8分)(1)②③⑤ (2)①②③④⑥ (3)①②⑦ (4)在A中加满水,盖紧瓶塞,用胶管连接b和c接口,收a导入NO气体,水通过b和c导入B中。

单项选择题 A1/A2型题
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     You might have such problems with a friend as follows:

     New friends replace an old friendship. You used to walk home from school with your friend, and

share everything. Now your friend is with someone else all the time and is always "too busy" for you.

One of your friends reveals a secret. You can not believe your ears. The deep, dark secret you shared

with your best friend was repeated back to you by someone you hardly know. Your friend told! Why

has your friend turned against you?

     These things hurt you. They make you feel angry and sad. In each situation your friendship would feel

threatened. When you are upset with someone, it is a good idea to go off by yourself and sort out your

feelings. Go for a walk, talk to yourself, and look at what you feel. Allow your anger to explode where

no one is around to hear you. Then calm down. Think through what you want to say to your friend.

     It helps to stand back and take a fresh look at your friendship. Just because you have been very close

to someone but it does not mean you are linked together or that you own one another. There should be

room in your friendship for other friends, higher achievements, slips of the tongue, sometimes a conflict is

a sign that you need to change the kind of friendship you have.

     It also helps to put yourself in your friend's shoes. What would you do if you found that you had more

fun with a new friend? What if you told your friend's secret to someone when you did not mean to? It is

painful to be the other, too.

1. What is the passage mainly about?

A. How to make friends with others.

B. How to solve some problems you may have with your friends.

C. How to get along with your friends.

D. How to avoid being hurt by your friends.

2. The underlined word "reveals" in paragraph 3 probably means "______".

A. treasures

B. records

C. forgets

D. lets out

3. When you find your friends turn against you, you'd better ______.

A. find a suitable place to explode your anger and then think carefully

B. quarrel with them at once

C. write a letter saying you don't want to be their friend again

D. find new friends, too

4. The author seems to believe that ______.

A. new friends can't replace old friends

B. a secret between two friends should be told to a third person

C. thinking more in your friend's position can solve some problems

D. ignore those friends who turn against you