A. 小苏打 B. 烧碱 C.生石灰 D.聚乙烯塑料
— Does he finish the picture?
— No. He _______ needs more time.
海洋文明和大河文明在政治体制方面呈现出“民主与专制”的明显差别,形成如此差别的主要原因是
We are playing football. Come and _____________ us.