（单选）Which one of the following can NOT be used to answer the question "Good morning, how did you sleep last night?"

A.美元汇率跌落，人民币币值上升，不利于我国出口
B．美元汇率升高，美元币值上升，不利于我国进口
C．美元汇率升高，人民币币值上升，有利于我国进口

A.L3
B．L2
C．L1
D．L4