如图，为某一时刻的波形图，此时刻质点P正在做减速运动，机械波波速为1m/s。平衡位置离坐标原点为0.57m的质点Q从此时刻开始到出现波峰的时间可能为

A．0.07s

B．0.27s

C．0.47s

D．0.67s

I can’t read these new words, so I have to __________ in the dictionary.

A．look it up

B．look up it

C．look them up

D．look up them