化妆前的清洁与皮肤护理的清洁都是（）在面部两侧同时进行。
A.单手
B.双手
C.右手
D.左手
参考答案：A
He _________ in American for five years, and now he works in Shanghai.
A．have worked
B．worked
C．had worked
D．have been working
掷两枚骰子，求所得的点数之和为6的概率．
