PAGE PAGE 8Unit 4 Astronomy:The science of the stars1. spreadvt.vi. 展开铺开散布扩大延伸The bird spread its wings. 那只鸟展开了翅膀Flies spread disease. 苍蝇传播疾病 常用结构:spread sth. with sth. 用……抹涂铺……spread ...on ..