以下情况，属于需求高弹性的是( )。

A．价格下降1%，需求量增加2%

B．价格上升2%，需求量下降2%

C．价格下降5%，需求量增加3%

D．价格下降3%，需求量下降4%

. It’s not important __________ you may call it. What is important is __________ you make good use of it.

A．what; when

B．that; how

C．what; how

D．how; what