Unit 4 seasons
重点短语：
1．What about…? …怎么样?
2．watch sb do sth看某人做某事
3．make footprints留下足迹
4．in the snow 在雪地里
5．by the sea在海边
6．start to do sth开始做某事
7．get warm变暖
8．blow gently/strongly轻轻地/猛烈地吹
9．turn green变绿
10．take a tip 去旅行
11．shine brightly明亮地照耀
12．go to the beach去海滩,去海边
13．swim in the sea在海里游泳
14．go on a picnic = have a picnic 去野餐
15．at this time of year在每年的这个时候
