急性黄疸型肝炎甲肝黄疸前期的时间是（）
A.1～3天
B.1～4天
C.5～7天
D.8～10天
E.15～30天
参考答案：A
用所给词的适当形式填空。
1. Today is June 1st, it's ______ ( child ) Day.
2. Lily with her brother ______ (have) to clean their garden.
3. We have fun ______ (talk).
4. Listen! Can you hear somebody ______ (cry) ?
5. Mr. Black, ______ (arrive) tomorrow.
造成品质尺寸不稳定因素有哪些？
