小明买了一本日记本用了6元8角，用小数表示是（ ）元。
6.80
治疗湿热痹证，应选用
A．石韦
B．泽泻
C．猪苓
D．木通
E．滑石
.—I can’t understand him well.
—He’s not very good at getting his meaning ______.
A．off
B．across
C．up
D．down
