設(shè)是定義在上以6為周期的函數(shù)，在內(nèi)單調(diào)遞減，且的圖象關(guān)于直線對(duì)稱，則下面正確的結(jié)論是                                                       

A．                        B．

C．                        D．

設(shè)f(x)是定義在R上以6為周期的函數(shù)，f(x)在(0，3)內(nèi)單調(diào)遞減，且y＝f(x)的圖象關(guān)于直線x＝3對(duì)稱，則下面正確的結(jié)論是

1. A.
   f(1.5)＜f(3.5)＜f(6.5)
2. B.
   f(3.5)＜f(1.5)＜f(6.5)
3. C.
   f(6.5)＜f(3.5)＜f(1.5)
4. D.
   f(3.5)＜f(6.5)＜f(1.5)

（A）f (1.5)< f (3.5)< f (6.5)         （B）f (3.5)< f (1.5)< f (6.5)     

（C）f (6.5)< f (3.5)< f (1.5)         （D）f (3.5)< f (6.5)< f (1.5)