题目

已知偶函数f(x)满足条件：当x∈R时，恒有f(x+2)=f(x),且0≤x≤1时，有f′(x)＞0，则f(),f(),f()的大小关系是A.f()＞f()＞f()                      B.f()＞f()＞f()C.f()＞f()＞f()                      D.f()＞f()＞f() 答案：B  ∵x∈R时恒有f(x+2)=f(x),∴f(x)周期为T=2.又0≤x≤1时,f′(x)＞0,∴偶函数f(x)在［0,1］上单调递增,在［-1,0］上单调递减.f()=f(6)=f(),f()=f(6)=f(),f()=f(6+)=f(),又0＜＜＜＜1,∴f()＞f()＞f(),即f()＞f()＞f().He is going to have ________ swim with me tomorrow. [　　] A．aB．anC．theD．×