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【单选题】
定义在（﹣∞，+∞）上的偶函数f（x）满足f（x+1）=﹣f（x），且f（x）在[﹣1，0]上是增函数，下面五个关于f（x）的命题中： ①f（x）是周期函数； ②f（x）图象关于x=1对称； ③f（x）在[0，1]上是增函数； ④f（x）在[1，2]上为减函数； ⑤f（2）=f（0）， 正确命题的个数是 [ ]A.
1个
B.
2个
C.
3个
D.
4个
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