我们市里的学校提供各式各样的选修课，以满足不同水平的学生。
Schools in our city provide a variety of optional classes to cater to students of different levels.
在小学和初中，学生的技能水平和努力程度不同。
In elementary school and junior high, students have such a variety of skill levels and effort levels.
你认为把不同能力的学生混合在一起的班级会妨碍较高水平学生的进步吗？
Do you think that mixed-ability classes hold back the better students?
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