小学教育的内容具有______和______。
参考答案：普遍性 基础性
---________ pieces of bread do you want? ---Two, please. And ________ are they?
A．How many, how much
B．How much, how much
C．How many, how many
D．How much, how many
急性心肌梗死于发病后（）小时内进行核素显像检查阳性率最高。
A.6～12
B.12～72
C.4～18
D.72～96
E.<12
