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【单选题】
下列哪项不是经空气传播的传染病流行病学的特征A.
传播广泛，发病率高
B.
无明显季节差异
C.
少年儿童多见
D.
在未经免疫预防的人群中，发病呈现周期性
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反馈参考答案：
举一反三
【简答题】句型转换 1. Don't worry. I can repair it on my own. Don't worry. I can repair it 2. Mr. Wang got up early so that he might not miss the early bus. Mr. Wang got up early _____ _____ _____ _____ miss the ea...
【单选题】— I don't really like Lily. Why did you invite her? — Don't worry. She come. She said he wasn't certain what her plans were. [ ]
A.
must not
B.
need not
C.
would not
D.
might not
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