希腊文化自身的源头在东方。
参考答案：对
现定义运算“★”，对于任意实数a、b，都有a★b=a2-3a+b，如：3★5=32-3×3+5，若x★2=6，则实数x的值是 [ ]
A.-4或-1
B.4或-1
C.4或-2
D.-4或2
She spends two days ________ this job.[ ]
A. to finish
B. finishing
C. finish
D. for finishing
