（09年湖南师大附中月考理）已知集合，≤，则 ( ) A．

（09年湖南师大附中月考理）已知集合，≤，则 ( )

A．

B．

C．

D．

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（09年湖南师大附中月考理）已知集合，≤，则 ( ) A．

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