单项选择题

您的浏览器不支持 audio 元素。

A.It’s over there.
B.It’s 9:30.
C.It’s too late.
D.It sounds good.
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单项选择题
A.Yes, I did.B.No, I didn’t.C.It was a waste of time.D.It lasted two hours.
A.Yes, I did.
B.No, I didn’t.
C.It was a waste of time.
D.It lasted two hours.
单项选择题
When we speak, sound waves begin to travel and go in all directions.
A.当人们说话时,声音向四面八方传开。
B.当我们说话时,声音就开始传播,并且向四面八方传开。
C.当我们说话时,声波开始传递,而且向四面八方传播。
D.当说话时,声波就开始旅行,并且走向四面八方。
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