古代中国农业的主要耕作方式，按顺序排列正确的是
①石器锄耕 ②刀耕火种 ③铁犁牛耕
A．②①③
B．③①②
C．③②①
D．②③①
答案：A
You'd better _____ upstairs and tell the children _____ make so much noise. [ ]
A. go, not to
B. go, don't
C. to go, not to
D. to go, don't
行政组织的基本要素有哪些
