某些食物的近似pH为：其中酸性最强的是
A．番茄
B．牛奶
C．泡菜
D．鸡蛋清
答案：C
拌制砂浆用砂，不得含有冰块和大于（）的冻结块
A.8mm
B.10mm
C.12mm
D.14mm
If you want to talk to your teacher,you should _____ first.[ ]
A. called to her
B. called up her
C. call her up
D. called her up
