已知集合A={-1，0，1，2}，B={-2，1，2}，则A∩B=[ ]

A.{1}

B.{2}

C.{1，2}

D.{-2，0，1，2}

把下面的一句话用另外的形式写出来（至少5种）不重复，不改变原意。 

我国加入了世贸组织。  

(1)                                                                                        

(2)                                                                                        

(3)                                                                                        

(4)                                                                                        

(5)