单项选择题

—I'm going to Beijing for a few days.— （）. I wish I could go with you.

A.It doesn't matter
B.Forget it
C.I really envy you

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水声学主要研究声波在水下的( )，用以解决与水下目标探测和信息传输过程有关的各种声学问题。

A.辐射
B.传播
C.接收
D.散射

— If you don't believe in yourself, no one else will.
— _____. Confidence is really important.