单项选择题

The central ________ of a library is to collect, organize, preserve, and provide access to knowledge and information.

A．misery
B．mission
C．mistress
D．missionary
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单项选择题
The number of tickets ________ will be determined by the size of the stadium.
A．adaptable
B．acceptable
C．advisable
D．available
单项选择题
National Academy of Sciences holds the stance that ________.
A．DNA testing should be systematized
B．only authorized laboratories can conduct DNA testing
C．the academy only is authorized to work out standards for testing
D．the academy has the right to accredit laboratories for DNA testing
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