九年级（3）班的思想品德课上正在上演同学们自编自导的小品《“拔刀相助”》，下面是小品的节选内容，请欣赏并回答下列问题。

场景──学生处办公室里张伟和刘洋正在被罗老师批评!

罗老师：你们居然在全校火灾消防演练的时间打架，真是吃了雄心豹子胆了!说说原因？

张伟：当时我和朋友正在走廊上聊天，结果被急冲冲跑下来的王勇碰到了胳膊。本来我就心情不好，所以就想乘机教训王勇一下，刚打了他一巴掌，刘洋就过来了……

刘洋：他不止打了王勇，还骂他。骂得很难听!我实在看不过去，就“拔刀相助”了!

罗老师：你们还挺有理由的呀!看看你们现在鼻青脸肿的样子，要不是王勇跑来叫我，还不得出什么大乱子……

刘洋、张伟：感谢老师，我一定会吸取教训的……

孟德尔的豌豆杂交实验表明，种子黄色(Y)对绿色(y)为显性，圆粒(R)对皱粒(r)为显性。小刚同学想重复孟德尔的实验，他用纯种黄色圆粒豌豆（P₁）与纯种绿色皱粒豌豆（P₂）杂交, 得到F₁, F₁自交得到F₂ ,F₂的性状如下图所示。根据基因的自由组合定律判断，错误的是（   ）

    To me, music is food and water. I can't live without it. I know this is not true for everybody. Usually lots of people go to concerts or listen to music records. Maybe some of you don't do these and you get along quite well, but music is everywhere in our life. For example, when you see movies or watch TV plays, will you find them interesting if there is no music? I'm sure you will find them boring. And when you are waiting for the train or the plane, you would like some music because it makes the time seem shorter.

    Some people like to sit by the sea and listen to the sound of the sea. Some enjoy listening to the singing of birds. Those sounds are some kind of music. So music has a meaning for everyone to some extent. （程度） Of course, it has special meaning for people like me. We spend our lives playing or writing music.

    Someone said," Through music a child goes into a world of beauty, learn to take care of others and makes his mind and body healthy." Music is really an important part of our life.

课外阅读。

                                                                                          呼唤和平

       朋友，虽然，我们生活在和平的环境中，但是，只要你关注一下国际动态，就会发现今天的世界并不太平，还有很多和我们一样的儿童，他们正在饱受战争的煎熬，所以，让我们大家一起来呼唤和平吧。

      当叙利亚内战爆发，一个个家庭流离失所。你看，那个小男孩，在短短的几天内，他就失去了妈妈，失去了家园，自己还被炸伤了。他那撕心裂肺般的哭喊牵动了世界人民。

      还有，1939年爆发的第二次世界大战，经历了长达六年的时间，先后有60多个国家和地区参战，波及20多亿人，死亡人数高达5000多万。

朋友，让我们大家一起来呼唤和平，不要再让世界发生战争，大家和睦相处，一起拯救那些还在战争中煎熬的人们，一起帮助那些在战争中失去父母的人吧！让我们大家一起来呼唤和平。