题目

草履虫是单细胞动物，不会发生哪种生命现象() A . 呼吸 B . 消化 C . 排出废物 D . 细胞分化 答案：D ---As a result of the heavy snow, the highway has been closed up until further____. ---Does that mean we can do nothing but wait? A. news                        B. information              C. notice                      D. message