题目

 “”是“函数的减区间是”的（     ） A.充分非必要条件．              B.必要非充分条件．     C.充要条件．                   D.既非充分又非必要条件． 答案：B–I’m glad to be offered the job. Shall I start tomorrow? – ______. See you tomorrow. A．That’s hard to say B．That depends C．That’s all right D．That would be great