单项选择题

James: Hello. May I speak to Peter Peter: ______.

A．Sorry, the number is engaged. Will you hold
B．Yes, speaking.
C．Hello. Who're you, please
D．Hello. Thank you for calling.
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单项选择题
Student: I've got the number for this book, but I wonder where I can find it.Librarian:______.
A．Look on the shelves at the end of the aisle.
B．It's not here.
C．The numbers marked on the shelves will help.
D．One never finds what he wants here.
单项选择题
The deep-sea listening system makes use of______.
A．the sophisticated technology of focusing sounds under water
B．the capability of sound to travel at high speed
C．the unique property of layers of ocean water in transmitting sound
D．low-frequency sounds travelling across different layers of water
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