根据材料内容，选择正确答案。

    Toronto is the biggest city in Canada. It is famous for the CN tower, Niagara Falls(尼亚加拉大瀑布)and some other famous places.

    The CN tower is 553 metres high. It is the world's highest tower. You can stand on a glass floor. Do you think it may break? If you think so, you are wrong, because the glass is very strong. If you look down from the CN tower, you will see a large stadium, the Skydome (天虹体育馆). The Skydome has a special(特殊的) roof(屋顶). The roof can open and close. So don't worry about the rain when you are watching a match there.

    Niagara Falls is one of the biggest falls in the world. It is made up of two falls. One is in the US. People call it American Falls. The other is in Canada. People call it Canadian Horseshoe Falls. The Horseshoe Falls drops from 52 metres high. It is 679 metres long. The sound of the water falling is so loud there. You cannot hear yourself talk! It is very exciting!

选出下列表述不正确的一项（     ）

1）校园位于山脚下,小河边,校内环境优美；

2）附近两年前建起了一家化工厂；

3）校园环境和师生健康受到严重影响；

4）请予以关注报道,引起有关部门重视。

话题参考词汇：排放污水: drain waste water    释放有毒气体: emit poisonous gas

有关部门 related departments

Dear editor,

    I'm Li Hua,

Yours sincerely,

Li Hua

①汽车在B站停了____分，在C站停了____分。

②A站到B站的距离是____千米。

③返回时汽车的速度是每小时____千米。