题目

如图所示是某一时刻一列向左传播的正弦波的图像，则该时刻P点的运动方向为A．向左         B．向右             C．向下             D．向上     答案：C听下面一段对话，回答第1至3小题。 1.Why is Peter worried? [     ]A.His father's camera is lost. B.His father's camera is in the pool.C.His father's camera doesn't work. 2.How much money does Peter need? [     ]A.600 yuan. B.2400 yuan.C.2500 yuan. 3.In order to buy a new camera,how long should Peter work at the job. [     ]A.For a month.B.For 4 months.C.For 6 months.