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问题 单项选择题

单开道岔，交叉点位置标准值横向距两线路任一线路中心不大于（）。

A、300mm

B、400mm

C、350mm

D、200mm

答案

参考答案：C

填空题

如下图所示探究平面镜成像特点时，将玻璃板作为平面镜竖立在桌上，通过玻璃板可以看到棋子A的像和棋子B。A的像是因为光通过玻璃       射到人眼里形成的，两个棋子大小相同，调整后B能和A的像完全重合说明：                             ，如果把玻璃板竖直向上提一点，B与A的像       （选填“仍能”或“不能”）重合。
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补全对话，情景问答
从方框中选择最佳选项完成对话，有两项多余。
A. Thank you.
B. I'm sorry to hear that.
C. Well, I finished work at about 8 o'clock.
D. I don't know.
E. Yes, I am.
F. What were you doing at 9 0'clock last night?
G. Where were you shopping at that time?

A: Are you Mr Smith?
B: __1__
A: I'm a policeman. Your neighbor, Ms Taylor, was killed last night.
B: __2__ What can I help you?
A: I need to ask you some questions. __3__
B: I was on my way home from work.
A: So were you working before 9 o'clock?
B: __4__ Then I went to the supermarket at about 8:15.
A: Were you shopping from 8:15 to  9:00?
B: Yes, I was.
A: OK. __5__
B: You're welcome.
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