在演示声音是由物体的振动发生的实验中，将正在发声的音叉紧靠悬线下的泡沫塑料球， 球被多次弹开。在此实验中，泡沫塑料球的作用是（   ）

1).活动背景：玫瑰市受灾情况介绍

2).活动目的：通过义卖筹集善款帮助受灾人民

3).内容：慈善物品拍卖，义演。

4).时间:本周六下午14:30

5).地点：学校操场。

注意：⑴须包括以上主要内容，可以适当增加细节，使内容连贯；

⑵词数：120左右，开头已给出，不计入总词数。

⑶参考词汇：玫瑰市 Rose City 慈善义卖会 charity bazaar 义演 charity performance

Dear classmates,

根据图中提供的信息，下列关于成人使用该药物的说法中，不正确的个数是（   ）

①首次服用该药物1单位约10分钟后，药物发挥治疗作用

②每次服用该药物1单位，两次服药间隔小于2小时，一定会产生药物中毒

③每间隔5.5小时服用该药物1单位，可使药物持续发挥治疗作用

④首次服用该药物1单位3小时后，再次服用该药物1单位，不会发生药物中毒．

词语填空                                              

 Dear Ronny,
　　Years ago you came to me for help. You said, "Grandpa, how could you do so ____   in your life? You're still active to your life, but I'm already tired of ____  for my life. How can I get the same thing that you've got?"
　　I didn't know what to say to you. But when I know there are few days left for me, I tell ____   that I should give you an answer. So here is what I believe.
First, you should know that life is filled(充满) with____  , and many of them are good ones. If you don't keep your eyes  ____ , you'll miss a number of good surprises in your life.　　
　　When you meet challenges, don’t run away, just welcome them. They'll make you stronger, ____  and cleverer than you were before. When you do something wrong, you should be thankful for the things it gave you. And then, you should use this lesson to help you ____ your dream come true. It's also important to decide what you want. Then keep your dream , work hard for it, and be ready to receive it. It will come true more quickly.
　　And always follow the rules, even the little ones. When you follow the rules, life will work well. ____   you think you can live without the rules, you're only fooling(愚弄) yourself.
　　There will be more chances  ____ you are growing up. So you have to be brave enough to move from a known place to an unknown place. Life isn't just like climbing one mountain. It is also a part of your life to move  ____ one top to the next. If you rest for a too long time, you may fail at last. Leave the past in the past. Climb the next mountain and enjoy the fight in your life.
　　The person that can win is the one who wants to win.
Love always,
　　Grandpa

速效感冒冲剂的主要成分之一是“对乙酰氨基酚”，其化学式为C₈H₉NO₂，有关它的叙述错误的是（　　）