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下列四个命题：①f（x）=|2-x|与 f(x)= x 2 -4x+4 表示相同函数；②函数 f(x)=( 1 3 ) x 的值域为R；③函数 f(x)= 2 x +1 2 x -1 是奇函数；④函数f（x）与g（x）=log 2 x的图象关于直线y=x对称，则函数f（x）= lo g 1 2 x 其中正确的命题序号是______．
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举一反三
【单选题】Where Mark Twain and William Dean Howells satirized European manners at times, ______ was an admirer.
A.
0. Henry
B.
Henry James
C.
Walt Whitman
D.
Jack London
【单选题】It was along the Mississippi Rever ____Mark Twain spent much of his childhood.
A.
how
B.
which
C.
that
D.
where
【单选题】以下哪位摄影师及其作品被誉为首次赋予纪实摄影社会责任
A.
约翰·汤姆逊《伦敦的街头生活》
B.
欧仁·阿杰《巴黎街头》
C.
阿尔弗雷德·斯蒂格利茨《驿站》
D.
布劳斯菲尔德《葫芦》
【单选题】It was along the Mississippi River ____ Mark Twain spent much of his childhood _____ the story happened. [ ]
A.
which; that
B.
that; which C where; that D. that ;that
【单选题】Where Mark Twain and William Dean Howells satirized European manners at times, __________ was an admirer.
A.
O. Henry
B.
Henry James
C.
Walt Whitman
D.
Jack London
【单选题】Where do most people think Mark Twain was born?
A.
Hannibal Missouri
B.
Florida, Missouri
C.
Mississippi River
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