题目

He knows so much about the story. He must have read the book,         ? A. mustn’t he       B. doesn’t he C. hasn’t he        D. didn’t he   答案：C“He must have read the book”中must 表示“一定，想必”等推测意义，而不表示“必须、禁止”等意义。“He must have read the book”相当于 “I’m sure he has read the book”相一致，即用hasn’t he, 而不用mustn’t he。  已知命题p：函数f（x）=sin2x的最小正周期为π；q：函数g（x）=cosx是奇函数；则下列命题中为真命题的是（　　）A．p∨qB．p∧qC．￢pD．（￢p）∨q