题目

如图是根尖示意图，请回答问题： （1）标明结构名称：A      、B伸长区、C分生区、D     ． （2）根生长最快的部位是         ． （3）根的长度不断增加，是              区的细胞能够      而增加数量和    区的细胞能够不断    而增大体积的缘故． 答案：（1）成熟区；根冠． （2）伸长区． （3）分生；分裂；伸长；伸长．After a day’s hard work I went to bed early than usual. It was about two o’clock in the morning when I was awakened by a big noise. I got out of the beds and slowly went  upstairs. There was a light in the living room. I listened to carefully and heard two men speak quietly. I believed my house had broken into and I was really frightening.  I went back upstairs and immediately call the police. You can imagine how embarrassed I was when they came upstairs but told me they had turned the television off for me and something was all right.