这是我自己写的，望采纳：
is it necessary for the junior three students to do exercise？in my view,it is a must,I know maybe they will think it is too busy to spare time for exercise。they should devote all of their time to study，because the effort the devote will determine whether can they enter a good high school，but，if they always study，it is easy for them to get ill，which can waste their much more time。
so，study hard and keep good healthy are both important。
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