如图所示，为一列向左传播的简谐横波在某一瞬时的图像，由图可知  （     ）

Ａ．质点F在该时刻的运动方向朝上

B．P、Q两质点的运动方向始终相反

C．从图示时刻开始算起，质点E比质点Q较早回到平衡位置

D．经极短时间，P质点速度值增大

As it was his first time to visit the science museum, the boy seemed _______

about everything there.

A．anxious

B．curious

C．particular

D．frightened