极地地区是研究地球环境的天然实验室，我国已先后在两极地区建立了多个科考站，读南极部分地区示意图，回答问题。

闻王昌龄左迁龙标遥有此寄

【唐】李白

杨花落尽子规啼，闻道龙标过五溪。

我寄愁心与明月，随君直到夜郎西。

    Have a look at the picture. There are many primary school students. They are practicing square （广场）dances on the school ground. A primary school teaches square dances to students. It is very interesting, isn't it?

    Square dances are popular in China, but most people associate（联系）them with old people. They think the actions are easy and slow and only the old people would like them very much. They can exercise their bodies, and they can also have fun with other friends.

    But the students in a primary school in Hebei have practiced square dances for over three years. The students practice square dances during their class break. The school also has a class every Wednesday afternoon to learn new square dances.

    Now, many students have learned more than 100 kinds of different square dances.

根据短文内容，判断下列各句正误。