【学渣】

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上课时,老师批评大海是“一只耳朵进一只耳朵出”。大海调皮地问老师:“那你猜我哪只耳朵进哪只耳朵出呢?”老师反问大海:“一只耳朵出的速度是4m/s,另一只耳朵进的速度是3m/s,请问什么时候能把耳朵灌满?”

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