费雪方程式中的P值主要取决于V值的变化。（）
参考答案：错
21.7÷1.4=[ ]
A．1.55
B．15.5
C．0.155
— Summer holiday is coming ! _______ will you go to Hainan for a trip ?
— In a few weeks.
A．How long
B．How far
C．How soon
D．How often
