2．作平面运动的三个构件之间共有三个速度瞬心，它们不一定位于同一直线上。
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站台服务包括进出闸机服务、乘客问询服务、帮助重点乘客服务等。（）
A. 对
B. 错
-Are you doing anything special on Friday, Bill?-_______-Oh, what a pity!
A. No, nothing special
B. Yes, I have promised to call on some friends
C. Yes, of course
D. No, I’m not sure. Why?
-I’d like to make an appointment with Mr. White.-_______
A. Sorry, he is busy at the moment.
B. Why didn’t you call earlier?
Certainly. May I know your name?
D. Sorry. He doesn’t want to see you.
-This is the worst film ever produced. Do you think so?-_______
A. You’re wrong
B. I don’t think so, I’m afraid
C. Not at all
D. No, that’s not real
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