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我们都清楚正常人每天的活动周期是大约 7～8小时的睡眠和16～17小时的清醒相互交替，我们也知道，一般来说，睡眠常在夜间......

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单项选择题
A．To sell and to inform.B．To increase prices and competition.C．To change the means of selling and buying.D．To take away chances of choosing from customers.
A．To sell and to inform.
B．To increase prices and competition.
C．To change the means of selling and buying.
D．To take away chances of choosing from customers.
填空题
The woman was protected in those societies by a
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