Learn to think ________ we are young, or we may never learn.[ ]A. during B. when C. beforeD. after-九

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• 用括号内所给动词的适当形式填空。1. I'll tell our monitor the good news as soon as he ________ (come) back to sc
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• （5分)下图是草履虫的结构图，请读图并完成后面的填空：（1）草履虫生活在淡水中，靠[]___________进行运动。（2）食物通过[]___________进入体内，形成食物泡，逐渐被消化；草履虫-
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