对食物的酸、碱性判断正确的是[ ]
A．西瓜是酸性食物
B．猪肉、牛肉是碱性食物
C．巧克力、奶油是酸性食物
D．大米、面粉是碱性食物
答案：C
To keep Chinese economy going on, the government has established an employment service system for _____ jobless urban residents, and for older laid-off and unemployed persons.
A．badly off
B．well off
C．cut off
D．paid off
沟通时为了增加信任应注意扩大自己的（）。
A.公开区
B.盲区
C.隐藏区
D.未知区
