票据丧失
参考答案：持票人非依本人意愿而失去对票据的占有，包括绝对丧失（如毁灭、焚毁等）与相对丧失（如遗失、被窃等）。
—Excuse me, where is Johnson?
—He cannot go home, as his book is lying __________on his desk.
A．openly
B．opening
C．opened
D．open
计算题：30.00mLHCl溶液，用C（NaOH）=0.1072mol/L的NaOH标准溶液滴定至终点，用去31.43mL，求HCl溶液的物质的量浓度C（HCl）。
