题目

Our school is on the side of Chaoyang Road; ________ our school is a large housing block wheremany people from the city live here. A. across     B.opposite C. in the front of     D.face   答案：B  opposite这里是介词，意思是“在……对面”，若用A项应说 “across the road is...”；C、D两个选项干扰性不大。  动植物细胞的区别是：植物细胞有细胞壁、叶绿体、液泡，而动物细胞中就没有。（     ）