利用如图实验装置制取氧气。

（1）实验中，若产生氧气的速率太大，不利于收集。为了减小反应速率，可以进行的合理操作是                 。

（2）若需要一瓶干燥的氧气，应该将装置A产生的氧气通过干燥装置后再与      (填“B”、“C”或“D”)相连。

（3）若用排水法收集了一瓶气体，并用带火星的木条检验，发现木条没有复燃，可能的原因有      

A．实验所用的过氧化氢溶液的溶质质量分数太小

B．开始收集时，侧置于水槽中的集气瓶未装满水

C．导管口一出现气泡就立即收集 

第二节（共5小题；每小题2分，满分10分）

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。注意：若选E涂AB；若选F涂AC；若选G涂AD。

71     You don’t need to admire those people who have beautiful houses with large gardens and swimming pools or those who have nice cars and a lot of money and so on. Why? Because those who have big houses may often feel lonely and those who have cars may want to walk on the country roads at their free time.

72    When you are in trouble at school, your friends will help you; when you study hard at your lessons, your parents are always taking good care of you; when you get success, people will say congratulations to you; when you do something wrong, people around you will help you; and when you do something good to others, you will feel happy.     73    If you notice a bit of them, you can see that happiness is always around you.

Happiness is not the same as money.   74   _  When you are poor, you can also say you are very happy, because you have something else that can’t be bought with money. When you meet with difficulties, you can say loudly that you are very happy, because you have more chances to challenge yourself. So you cannot always say you are poor or you have bad luck. As the saying goes, life is like a revolving（旋转的） door.  75  If you take every chance you get, you can be a happy and lucky person.

A.All these are your happiness.

B.Without money, we can live a happy life.

C.Happiness is for everyone.

D.She has no chance to go to school.

E.It is a feeling of your heart.

F.You are happy when you help a helpless man.

G.In fact, happiness is always around you if you put your heart into it.