机械制图中表面粗糙度符号上的数字50其单位是（） A: umm B: mm C: dmm D: umm

Which interjection would you use if you felt a sudden pain? A: Well! B: Umm... C: Uh-huh! D: Ouch!

Person A: "Hey Jill." Person B: "What's up, Mike?"Person A: "I was wondering if you have any plans for tomorrow night." Person B: "Umm... I don't think I have anything special for tomorrow. Why?"Person A: "Do you want to see Titanic with me?" Person B: "I wanted to see that. Yeah. Let's go."Person A: " ________ " Person B: "How about seven thirty?"Person A: "Sure. I'll meet you at the theatre at seven. A: What time is good for you? B: When is good for you? C: See you then. D: Ok, let’s go.

[听力原文]W: Your roommate told me that I could find you here. What are you doing hereM: What does it look like I am doingW: Well, it looks like you are watching television, but we have a math test tomorrow, so I thought you’d be studying for it and maybe I can study with you.M: Oh, well, I am just taking a break. This equation (方程式) stuff gives me a headache if I work on it too long.W: I know what you mean. I’ve been working on it for three hours already. I’m beginning to go over. I just don’t get some of them.M: But I can’t believe you are coming to me. I mean you know what I got on the last test, don’t youW: Yeah, I know. You told me. I just thought two heads might be better than one.M: Yeah, that’s a good idea, but... you know, I wish I knew that person in our class who got a full score on the last test. She didn’t miss a question, Umm... was it MaryW: Oh yeah, Mary! She is my friend. She’d be a big help right now. Why don’t I give her a callM: Now It’s already 10:30. I don’t want to impose on her.W: Yeah, I guess you are right, but you know what, she owes me a big favor. Let’s at least give her a call and see what she says. Maybe going over some of the problems with us would help her review the material.M: That’s worth a try. What will the two speakers do next（） A: Call a friend for help. B: Review some materials. C: Do a friend a big favor. D: Go over some problems.