板坯和方坯的区别是宽厚比，宽厚比（）是板坯。
A.>1
B.>2
C.>3
D.>4
参考答案：C
道路上划设这种标线的车道内允许下列哪类车辆通行？（）
A．出租车
B．公务用车
C．公交车
D．私家车
---It’s a long time ______ I last saw you.
---Yes, and it will be another month ______ we can meet again.
A．before; when
B．when; since
C．since; while
D．since; before
