“烽火戏诸侯”发生时的国王是[ ]
A．周幽王
B．周文王
C．周厉王
D．周平 王
答案：A
The traffic rule says young children under the age of four and less than 40 pounds must be in a child safety seat.
A．being weighed
B．to weigh
C．weighed
D．weighing
（ym）3yn的运算结果是[ ]
A．ym（3+n）
B．y3m+n
C．y3（m+n）
D．y3mn
