A

Mr Wu: Good morning, Bruce. Sit down, please. May I ask you some questions?

Bruce: Certainly. What do you want to know?

Mr Wu: First, when were you born, Bruce?

Bruce: On June 22,1980.

Mr Wu: Secondly, where were you born?

Bruce: In Sydney, Australia.

Mr Wu: Where was your father born?

Bruce: He was born in Sydney, too.

Mr Wu: When was he born?

Bruce: Sorry, I don't know. But I know he's about forty years old.

Mr Wu: I see. What does your father do?

Bruce: He's a doctor. He works in a hospital here.

Mr Wu: Is your mother working in China, too?

Bruce: No, she works in Sydney. She's coming to China soon.

Mr Wu: Oh, that's very good. I have no more questions. Thank you, Bruce.

Bruce: You're welcome, Nr Wu. Good-bye.

Mr Wu: Good-bye.

如图，直三棱柱的侧棱长和底面边长均为2，正视图和俯视图如图所示，则其侧视图的面积为（   ）

两个锐角的和一定大于直角．