单项选择题

下列原始居民中，最早掌握人工取火的是（）

A.大汶口人
B.半坡人
C.山顶洞人
D.河姆渡人

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单项选择题

职业性有害因素不包括:

A．机器的噪声
B．生产性粉尘
C．饮水中的高氟
D．长时间处于不良劳动体位

单项选择题

At a business dinner, when can you begin talking business? A.
As soon as food is ordered and pleasantries are exchanged, as long as everyone knows the dinner is a “working” one. B.
As soon as the food order is made. C.
As soon as everyone arrives at the table and has exchanged pleasantries. D.
As soon as everyone has chosen a menu item to order, but before the order is made.