以下______不属于对象的基本特征。 A．继承性 B．封装性 C．分类性 D．

Do you want to be a famous doctor ________ animals?[ ]

A. at           

B. for          

C. about          

D. like

根据句意及首字母完成句子.

1. Did you see the p_       on the wall?

2. He was c____     by a former champion.

3. He loves animals and wants to be a v____    when he grows up.

4. Did you see the a____     on the wall?

5. --I'd like to help h____     people

    --You could give out food at a food bank.

若点P是正四面体A-BCD的面BCD上一点，且P到另三个面的距离分别为h₁，h₂，h₃，正四面体A-BCD的高为h，则（　　）

A．h＞h₁+h₂+h₃

B．h=h₁+h₂+h₃

C．h＜h₁+h₂+h₃

D．h₁，h₂，h₃与h的关系不定

Sam enjoys ______ stamps. And now he has 226 of them. [ ]

A. to collect

B. collected

C. collects

D. collecting

如何发现稿件中的事实差错？