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问题
单项选择题
调车作业繁忙的车站牵出线与其相邻线间的最小距离为()mm。
A.6500
B.6000
C.5500
D.5000
答案
参考答案:A
填空题
Look at the picture and fill in the blanks. 看图写句子。
1.
Is this a chicken or a duck?
It's a
.
2.
a cow or
!
It's a pig.
3.
Is this a house
?
.
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选择题
The classroom is so dirty. _________ we clean it?
A.shall
B.Will
C.Would
D.Do
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