保险合同的当事人包括（）。
A.保险人和被保险人
B.投保人和受益人
C.保险人和投保人
D.被保险人和受益人
参考答案：C
There was an _________ look on his face when he knew the bad grade of his son.
A．worrying
B．exciting
C．worried
D．excited
售前车辆的行驶公里数不能超过（）公里
