猩红热首选抗生素（）
A.青霉素
B.红霉素
C.氯霉素
D.磺胺类
E.头孢氨苄
参考答案：A
They promised ________ out more at home.
A．to help
B．help
C．helping
D．helped
给下列对话排序。
1. Hi, Mike!
2. I'm fine. Thank you.
3. Hi, Sarah! How are you?
4. Fine, thanks. How are you?
5. Goodbye.
正确的顺序是: ________________________
