近几年，我国加大了农村的电网改造。广东省的某县将3个镇的农户用电价格下调了30％－40％，当年农民用电就提高了3倍。这说明

A．在特定条件下，价格不由价值决定

B．价格对人们的生活有影响，价格降低，人们的需求增加

C．价格变化对生活必需品的需求影响不大

D．价格影响需求。需求影响价格

—Look, here is my new mobile phone.

—It's very nice. Could you tell me ______?[ ]

A. how much is it

B. how much it is

C. how much does it cost

D. how much it will cost