泥岩的颗粒直径是（）。
A、0.1～2mm
B、2～100mm
C、0.01～0.1mm
D、小于0.001mm
参考答案：D
If there were no examinations, we should have ______ at school.
A．the happiest time
B．a more happier time
C．much happiest time
D．a much happier time
什么是工作区？VFP用什么来表示和区别工作区？
