第一节Dear Mr GeorgeI am Li Hua, a volunteer of the activity"Englishi Communication to the Mountains". Now, I'm writing toexpress my sincere apology to you for not being present atthe activity to be held next Monday.The reason for my absence is that I suddenly fell illMy parents sent me to hospital, and I have to stay therefor a week. As for my volunteer work, I have asked myclassmate Tom to do it.Sincerely hoping that you can accept my apologiesYours.Li Hua

5.B质点a与质点b的平衡位置相距4A,选项A错误;根据振动与波动的关系可知,=0时刻,质点c在平衡位置沿y轴负方向运动,因此图乙为质点c的振动图象,选项B正确;=0时刻,质点a离平衡位置最远,加速度负向最大,质点b在平衡位置,振动速度正向最大,选项C错误;质点并不沿波传播的方向发生迁移,选项D错误

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