平网的宽度不小于（）。
A.5m
B.3m
C.2m
D.10m
参考答案：B
—_______ have you been like this ?
—Two days.
A. How often B. How long C. How much
目前我国烟叶税的税率为______
A．3%
B．5%
C．17%
D．20%
