题目

鲫鱼在水中游泳，它的运动器官是（  ） A.鳃            B.鳔               C.鳍          D.侧线 答案：C 【解析】 试题分析：鱼与水中生活相适应，呼吸器官是鳃，运动器官是鳍，而鳔能调节身体比重，侧线能感知水流，测定方向，所以选C 考点：本题考查鱼的运动器官知识，解答此题需要学生知道鱼与水中生活相适应，呼吸器官是鳃。根据中文提示，用所给词组的适当形式填空。每空一词。1.  ________ ________ (四分之三) of the information is written in English. 2. Maria ________ ________ (无法容忍) the cold when she was in Harbin last year. 3. Loud noise can cause ________ ________ (听力丧失). 4. Our government has ________ ________ (采取措施) to solve the population..5. You ought to ________ ________ (关掉) the lights when you leave the room..