A:a曲线
B:b曲线
C:c曲线
D:d曲线
— Which do you like better, beef noodles or tofu noodles?— I ______ beef noodles to tofu noodles. I used to have them for breakfast.
读“京津冀区域轮廓图”,回答下列问题.
以下事例中,能够说明声音产生原因的是( )