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【简答题】
给出下列命题： ①如果函数f（x）对任意的x 1 ，x 2 ∈R，且x 1 ≠x 2 ，（x 1 -x 2 ）[f（x 1 ）-f（x 2 ）]＜0，则函数f（x）在R上是减函数； ②如果函数f（x）对任意的x∈R，都满足f（x）=-f（2+x），那么函数f（x）是周期函数； ③函数y=f（x）与函数y=f（x+1）-2的图象一定不能重合； ④对于任意实数x，有f（-x）=-f（x），g（-x）=g（x），且x＞0时，f′（x）＞0，g′（x）＞0，则x＜0时，f′（x）＞g′（x）． 其中正确的命题是 ______．（把你认为正确命题的序号都填上）
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举一反三
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【单选题】—Where does John live? —He lives on _____ floor but he doesn't use a lift to go up and down. [ ]
A.
nine
B.
the ninth
C.
ninth
D.
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