题干
The New Year's concert will ______ on New Year's Eve.
A：take place
B：happen
C：take place of
D：happen to
答案(点此获取答案解析）
A
The New Year's concert will ______ on New Year's Eve.
A：take place
B：happen
C：take place of
D：happen to
轴正方向传播，处在
和
的两质点
、
的振动图像如图所示。由此可知（ ）
