如图所示，是一列简谐波在t= 0时刻的波动图象，已知这列波是沿x轴正方向传播，波速为20 m/s，则下列说法正确的是

A．质点P的周期是0.1秒

B．波长为2米

C．此时质点P的速度方向向下

D．波的周期为0.1秒

When the Indian Ocean earthquake and tsunami(海啸),  the  worst—ever  natural  disasters, happened, the people there _____ heavy losses.

A．received

B．suffered

C．accepted

D．occurred