某校食堂使用大小、手感完全一样的餐票，小明口袋里有一元餐票2张，两元餐票3张，五元餐票1张，若从他口袋中随意摸出2张，则其面值之和不少于4元的概率为（　　）

如图所示，一个质量为m=2kg的均匀球体，放在倾角θ=37°的光滑斜面上，并被斜面上一个竖直的光滑挡板挡住，处于平衡状态．求球体对挡板和斜面的压力．（sin37°=0.6，cos37°=0.8，g=10m/s²）

Mr. Brown: Good morning. My name is Edward Brown. I'm your new ____, and I moved in yesterday.

Mrs. Smith: Good morning, Mr. Brown. May I help you?

Mr. Brown: I'm trying to do some work now. But I'm afraid your children are making too much ____.

Mrs. Smith: Oh, I'm sorry, Mr. Brown. But you know it's____ to keep little boys quiet.

Mr. Brown: But I can't stand it any more. I couldn't work and I couldn't ____ at all last night.

Mrs. Smith: I'm very, very sorry. I'll do my best to keep them quiet. But I'm not sure it'll work.

Mr. Brown: Well, it seems I have to put up with it now.

Mrs. Smith: Don't ____. My husband will come back from business tonight. And the boys always listen to him.