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.
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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
单项选择题
The technology supplied by Motorola is based on______.
A．Bluetooth features
B．MP3 audio capability
C．Global Positioning System
D．GPRS standard
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