图中四位同学正在讨论某一化学方程式表示的意义，他们所描述的化学方程式是（　　）

    Friends, I'd like to____you something important. Before you go to another country, it is a great help if you know the language and some of the  ____of the country.

    When people meet each other for the____time in Britain, they say “How do you do?” and shake____. Usually they do not shake hands when they just meet or say goodbye. But they shake hands after they haven't____for a long time or when they will be away from each other for a long time.

    Last year a group of German students____to England for holiday. Their teacher____them that the English people hardly shake hands. So when they met their English____at the station, they kept their hands behind their backs. The English students had learned that the____shake hands as often as possible, so they put their hands in front and got ready to shake hands with them. It ____both of them laugh.

课外阅读。

                                                         夸（kuā）父逐（zhú）日

     古时候，北方有一个巨人，名叫夸父。他双耳挂着两条黄蛇，手里拿着两条黄蛇，住在一座荒凉的山上。

     夸父生性喜欢探求。夸父与太阳竞跑，一直追赶到太阳落下的地方；他感到口渴，想要喝水，就到黄河、渭水喝水。黄河、渭水的水不够，又去北方的大湖喝水。还没赶到大湖，就半路渴死了。

      夸父死的时候，丢掉了手中的拐杖，拐杖落下的地方，变成了一片桃林。