单项选择题

The cost of self-education has fallen with the multitude of sources of knowledge and information _______ on CD-ROMs and the Internet.

A． preferable
B．ready
C．available
D． considerable
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单项选择题
The company owns a large number of _______ stores.
A．export
B．bargain
C．retail
D． trade
单项选择题
Six years __ before she got another note from Teddy.
A．went into
B．went around
C．went by
D． went on
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