当a为何值时（x2+ax+1）（x2-3x+2）的运算结果中不含x2项？
解：a=1
It is difficult to find a satisfying job today．This job is great ________ salary, but it has some disadvantages．
A．in terms of
B．in case of
C．in favor of
D．on top of
亚述位于美索不达米亚平原的（）部
A、东
B、南
C、西
D、北
