中学生的主要生活内容和基本任务就是学好课堂知识，没必要花费时间去陶冶情趣，这会分散学习精力。 [ ]
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My brother goes to school ____. [ ]
A. ride his bike
B. on bike
C. by his bike
D. on his bike
用准确的语言对下列算式作出表述。（不超过15 字）
9-6 ÷3 =?
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