已知：Ⅰ．CR﹣39单体结构简式是：
Ⅱ．酯与醇有反应RCOOR′+R″OH →△催化剂 RCOOR″+R′OH（R、R′、R″代表烃基）
生态系统有“绿色水库”之称的是____，被称为是“地球的肾”的生态系统是____，每年生产的氧气最多的生态系统是____．
电动自行车是生活中重要的交通工具，某品牌电动自行车的铭牌如下：
车型：
电池规格：
20寸（车轮直径：508mm）
36V12Ah（蓄电池）
整车质量：40kg
额定转速：210r/min（转/分）
外形尺寸：
L1 800mm×W650mm×H1 100mm
充电时间：2h～8h
电机：后轮驱动、直流永磁式电机
额定工作电压/电流：36V/5A
当蓄电池充满电量后，根据此铭牌中的有关数据，下列说法不正确的是（ ）
阅读短文，选择填空。
My grandfather is fifty-five years old. He's a taxi driver. He loves his job very much. It is Sunday. Today is his birthday. My father, my mother and I are in his home. My uncle also comes here. He's a tall man. He's a worker. He comes to see my grandfather every Sunday. My grandfather has a good friend. His name is Jim. He's from England. He's a nice cook. He comes to see him, too. My grandfather is very happy today.
下列生物的变异有利于生物生存的是（ ）
