Directions: Write an English composition in around 120 words according to the instructions given below in Chinese.
线上学习期间，你班（校）一定开展过各种丰富多彩的线上活动。请以An Unforgettable Online Class (or School) Activity为题，记叙一次让你难忘的线上活动。
内容须包括：介绍该线上活动的主要内容；该活动对你的影响。
(*注意：不要出现真实的校名、姓名)
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