题目

植物原生质层是指 A．细胞质和细胞器基质 B．细胞膜和液泡膜之间的细胞质 C．细胞膜和液泡膜 D．细胞膜和液泡膜及两层膜之间的细胞质 答案：D补全对话, 根据图片内容，选择适当的句子完成对话 A. Is she your mother? B. Is he your father? C. Yes, she is.D. He's my brother.E. No, he isn't.1.________ 2.________ 3.________ 4.________ 5.________