单位平均经常成本因学生人数增加而下降的情况称为（）。

患者徐某，64岁，患糖尿病10年，常规进行胰岛素6U，餐前30分钟，H，tid。'H'译成中文的正确含义是

A.皮内注射
B．皮下注射
C．肌内注射
D．静脉注射
E．静脉点滴

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听力原文：M: Hi, Sarah, what's up?W: Oh, hi. I just got out of a history class. I had to give a presentation.M: How did it go?W: Terribly. I'm sure I made a fool of myself.M: Why? Weren't you prepared?W: No, it's not that. I just get so embarrassed and nervous whenever I've to speak in front of a group of people. I stand up and my face gets red and then I get even more nervous because I know everyone can see me blushing.M: It is not so bad to blush.W: But it happens all the time. If the professor asks a question and I know the answer, I'll blush like crazy if he calls on me. Doesn't that ever happen to you?M: No, not really. Maybe you should try to forget about the people. Look at something else in the room, like the exit sign.W: I guess I could try that. But I doubt it will help.M: You know we talked about this in psychology class. Blushing, even though it's involuntary, is more or less a learned behavior.W: What do you mean?M: Oh, children hardly ever blush at all. And, among adults, supposedly women blush more than men.W: I wonder why.M: I don't know. But I had a friend in high school, Brian Smith. It was really easy to make him blush. He turned red whenever a waitress would ask him for his order.W: I'm not that bad. Well, I've got to get going for my next class. I'll talk to you later.(20)A．She felt embarrassed in class when making a presentation.B．Her presentation received a poor grade.C．She had not completed her assignment.D．She was unable to attend her psychology class. 点击查看答案