单项选择题

A．Windows.
B．A specialized software.
C．MS-DOS.
D．Not mentioned.
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单项选择题
A．She is going to give up biology.B．She spends half of her time on biology.C．To her, biology is difficult, but math is not.D．To her, math is even more difficult than biology.
A．She is going to give up biology.
B．She spends half of her time on biology.
C．To her, biology is difficult, but math is not.
D．To her, math is even more difficult than biology.
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