上浮的物体和下沉的物体在水中都受到____的作用，我们可以感受到浮力的存在，可以用____测出浮力的大小。

古希腊人把“能认识自己”看作是人类的最高智慧。“认识自我”这是镌刻在古希腊德菲尔城阿波罗神庙里唯一的碑铭，犹如一把千年不熄的火炬，表达了人类与生俱来的内在要求和至高无上的思考命题。关于认识自己，古今中外还有许多谚语，如“要想了解自己，最好问问别人。”“只有在人群中，才能认识自己。”

5月31日是“世界无烟日”，很多公共场所贴了如下图所示的标志，这主要是考虑到在空气不流通的房间里，只要有一个人吸烟，整个房间就会充满烟味，这是因为（   ）

根据内容及首字母提示完成短文。

    There are four seasons in the year. Then I will i____ the four seasons of the year.

    In the year, the f____ season is spring. Spring is a beautiful season.

    Summer comes a____ spring. It's the h____in a year. In summer there are some persons at home and t____ on the air-conditioner(空调). Summer is hot and sunny. But I like summer very much. Because I can eat some ice-creams and go s____.

    I think autumn is better than summer. Autumn is a wonderful season and a h____ season. In autumn I can eat so many fruit and food. And the trees are golden.

    Winter is the l____ season of the year. In winter I can play s____ with my friends.

    In my city, every season has three m____. The weather of the season is different from that of any other.