鱼腥草用于肺痈、咳吐脓血是取其什么功效（）。

A.清热泻火

B.清热解毒

C.消痈活血

D.消痈排脓

E.活血祛瘀

句型转换。

1. She is my aunt.(改为一般疑问句，作否定回答)

    — _____she _____aunt?  

    —_____

2.  We are good friends. (改为一般疑问句，作肯定回答)

    — _____  good _____?

    — _____.

3. My uncle is a policeman. (改为否定句子)

    My uncle _____a policeman.

4. They are my sisters. (改为单数句子)

    _____ my_____.

5. That boy is my brother.  (改为复数句子)

    _____ our_____.