哮喘持续状态是指严重哮喘持续时间在（）
A.12小时以上
B.20小时以上
C.24小时以上
D.48小时以上
E.72小时以上
参考答案：C
连词成句。
1. April is birthday 2nd her.
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2. is birthday Ellen's when?
3. Jack is old how?
4. birthday August your is 12th?
5. a festival have we music.
