人免疫缺陷病毒属于（）。

A.单链DNA病毒

B.双链DNA病毒

C.单链RNA病毒

D.双链RNA病毒

E.缺陷型病毒

根据句意及汉语或首字母提示,填写恰当的单词。

1. It's my_____ (责任) to take good care of my parents when they are old.

2. We all _____ (将……视为) Yao Ming as the greatest basketball player from China.

3. I don't think your son has _____  (认识到) how important English is to him.

4. Please read the text a _____  , so all of us can hear you.

5. This is a new word. Can you tell me how to p _____  it?