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.

绿眼虫是一种长梭形、绿色的动物，可用来监测水污染，它属于单细胞动物．单细胞动物的特征是（　　）