(2x-3)5的展开式中x2项的系数为[ ]
A、-2160
B、-1080
C、1080
D、2160
答案:B
Bob doesn't know the way to the cinema. I don't know, ______. [ ]
A. too
B. either
C. also
D. neither
特洛伊木马攻击的威胁类型属于______。
A.授权侵犯威胁
B.植入威胁
C.渗入威胁
D.旁路控制威胁