单项选择题

A．At the bookstore.
B．At the library.
C．At the travel agency.
D．At the hospital.
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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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