单选题：He spends money like water. In fact, his expenses on food an

题目内容：
He spends money like water. In fact, his expenses on food and clothes are rather high his income. A．in respect of
B．in contrast to
C．in response
D．in proportion to

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答案解析：

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当A类IP地址34．0．0．0使用8个二进制位作为子网地址时，它的子网掩码为( )。A．255．0．0．0 B．255．255．0．0 C．255．255．25

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