题目

目前很多学生整天忙于学习，但效率低，成绩却不理想。关于如何解决这个问题，提高学习效率一位专家从体育锻炼，学习方法等方面为我们提供了建议。请补全以下内容，每空一词。 A great number of students can't finish their tasks, which leads to bad results. Here are some suggestions on how to 【1】 the problem.First, you need to find an effective learning method. Make sure that you listen to the teacher actively in class. Taking notes will help you remember what the teacher said. 【2】 class, review your lessons in time and如图所示，小物体（可视为质点）在水平传送带上向右运动，A为终端皮带轮，已知皮带轮半径为r，传送带与皮带轮间不会打滑。当小物体可被水平抛出时，A轮每秒转动圈数最少是（重力加速度为g）A． B． C． D．