填空题

This article mainly tells us why dinosaurs ate grass.

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1. 不注意公共卫生可导致许多疾病的传播 2. 中国人的生活习惯中有哪些容易导致疾病的传播 3. 有什么方法可帮助人们改掉这些坏习惯 Stop Spreading Diseases
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The outlines of easily visible leaves and stems cannot be found in fossils older than tiff million years.
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