题目

用所给词的适当形式填空。1. My friends often _______ (paint) many pictures in the classroom.2. The twins will have _______ (swim) lessons.3. Do you want to be a _______ (drive). 4. I want to be a _______ because I like _______ (travel). 5. Jim’s parents are doctors. My parents are _______ (farm). 答案：【答案】1. paint 2. swimming 3. driver 4. traveler travelling 5. farmers 【解析】1. often提示是经常，用一般现在时态，my friends我的朋友们是个复数名词，所以paint不用变化，所以答案是：paint。2. 游泳课是swimming class，class是个名词，swim加了ing可以修饰名词，所以答案是：swimming。3. a是一个，drive开车是个动词，要换下列关于物质跨膜运输的叙述，错误的是 A．植物细胞积累K+需消耗能量 B．细胞对离子的吸收具有选择性 C．海水中的海藻细胞可通过积累溶质防止质壁分离 D．液泡中积累大量离子，故液泡膜不具有选择透过性