There are no right or wront to the question 'Is it necessary for Grade 9 students to do lots of exercises', though I personally think that exercises are good for health and is necessary for all ages. Of course, nobody should exercise over limit, because it would be tiring and that would cause students to be distracted at work and studying. So as a conclusion, students should control their time limit of exercising. 我是国际学校的... 希望能帮到你 写的不是很多 望采纳。
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