Tom has three good friends. They are Jack, David and Mark. They have different hobbies. Tom likes football. He often plays football on weekends. He thinks playing football can make him strong and healthy. He is in the school football team.

    Jack doesn't like sports. He likes listening to music. He likes Jay Chow best of all the singers. He has many of his CDs. He often listens to music on the way. He thinks music can let him feel happy.

    David doesn't like sports or music. He likes stamps. He collects stamps for five years. The stamps are very beautiful. He thinks collecting stamps can help him know more about the world.

    Mark likes taking photos. He has a few cameras. When he is free, he often takes out his camera and takes some pictures. Some of his pictures are in the newspapers. He thinks the world is beautiful. He wants to show the beauty of the world to others.

玲玲和贝贝沿京哈线去东北地区考察,玲玲考察当地民族风情,贝贝考察当地的城市分布。

如图所示．物体M在水平导轨上平移时．带动滑动变阻器的滑片P移动，通过电压表显示的数据，可反映出物体移动距离的大小．下列说法正确的是（    ）

行路难(其一)

李白

金樽清酒斗十千，玉盘珍羞直万钱。

停杯投箸不能食，拔剑四顾心茫然。

欲渡黄河冰塞川，将登太行雪满山。

闲来垂钓碧溪上，忽复乘舟梦日边。

行路难!行路难!多歧路，今安在?

长风破浪会有时，直挂云帆济沧海。