材料一：

材料二：董仲舒说：“《春秋》大一统者，天地之常经，古今之通谊也。今师异道，人异论，百家殊方，指意不同，是以上亡以持一统；法制数变，下不知所守。臣愚以为诸不在六艺之科、孔子之术者，皆绝其道，勿使并进。邪辟之说灭息，然后统纪可一而法度可明，知所从矣。”

材料三：黄宗羲说：“凡天下无地而得安宁者，为君也。是以其未得之也，茶毒天下之肝脑，离散天下之子女，博我一人之产业，曾不惨然。……敲剥天下之骨髓离散天下之子女，以奉我一人之淫乐，视为当然，……然则，为天下之大害者，君而已矣！”

如图，MN为铝质薄平板，铝板处在与板面垂直的匀强磁场中（未画出）．一重力不计的带电粒子从紧贴铝板上表面的P点垂直于铝板向上射出，从Q点穿越铝板后到达PQ的中点O． 则带电粒子穿过铝板前后动能之比____．

阅读短文，下列问题

 B

American boys and girls love to watch television. Some children spend six hours a day in school and four to six hours a day in front of the television set. Some even watch television for eight hours or more on Saturday.

     Televisions are like books or films. A child can learn bad things and good things from them. Some programmes (节目) help children to understand (理解)the news, others show people and places from other countries or other time in history. With television a child does not have to go to the zoo to see animals to the ocean to see a ship. Boys and girls can see a play, a concert or a game at home.

     Television brings many places and events into our homes. Some programmes show crime (犯罪) and other things that are bad for children, so parents sometimes help them to find other interesting things to do.

云儿哪里去了

【英】伊丽莎白

我想知道云儿哪里去了？

我想知道风儿在说什么？

我想知道天上为什么下雨？

我想知道鸟儿怎样飞回？

我想知道花儿怎样生长，

才使世界有这么多的颜色？