下列哪种情况急需用西地兰治疗（）

A.心衰并阵发性室上性心动过速

B.急性心肌梗死

C.病毒性心肌炎

D.窦性心动过速

E.预激综合征并房颤

完成句子。

1. We often begin our speech with "_____ (女士们) and gentlemen!".

2. The Smiths just came back from Qingdao. They had a lot of fun _____ (旅行) there.

3. He does everything well because he is always _____ (严肃的,认真的) about what he does.

4. He put down the school bag and _____ (扫除) the floor of the room.

5. Can I use your dictionary? _____ (我的) is at home.

6. They usually buy lots of books _____ (虽然) they are not rich.