秦统一后用下列哪种钱币可以在咸阳城买到东西[ ]
A．圆形方孔钱
B．刀形币
C．铲形币
D．蚁鼻钱
答案：A
三种溶液（1）PH=5，（2）[H+]=10-4mol/L，（3）[OH-]=10-11mol/L，三种溶液中酸性最强的是（）。
He _____ basketball and knows a lot about it.[ ]
A. is interested about
B. is interesting in
C. is interested on
D. is interested in
