填空题
People used to think that there is no grass before the extinction of dinosaurs.
【参考答案】
Y
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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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单项选择题
A.hand outB.hand inC.hand offD.hand over
A.hand out
B.hand in
C.hand off
D.hand over
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