从某地区旅馆火灾损失(单位：万元)中抽出一个样本：6，7，7，3，8，5，3，9。则该样本的众数是3和7。______
参考答案：对
_______ the manager came to Beijing on business, he would visit his old friends there.
A．Every time
B．Many times
C．In no time
D．All the time
天然玉石
