A:A killer whale is longer than a sperm whale.
B:A sperm whale is shorter than a killer whale.
C:A sperm whale is longer than a killer whale.
A,B,C,D四种物质的转化关系如图所示(所需反应条件略去〕:
如图正方形ABCD的边长为2,点E、F、G、H分别在AD、AB、BC、CD上的点,且AE=BF=CG=DH,分别将△AEF、△BFG、△CGH、△DHE沿EF、FG、GH、HE翻折,得四边形MNKP,设AE=x,S四边形MNKP=y,则y关于x的函数图象大致为( )
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