有权决定民族乡的建制和区域划分的机关是（）
A．县级人民政府
B．直辖市的人民政府
C．国务院
D．省人大常委会
参考答案：B
--- Good news, Edward has won 5 million pounds in last week’s lottery.
---How exciting! ________________________.
A．When the cat’s away, the mice will play
B．Every dog has its day
C．Many hands make light work
D．Don’t put all your eggs in one basket
已知m，n是正整数，且m2+n2+4m-46=0，求mn的值．
