12.A【解析】由题,/(x)=c-f(n2),得f(n2)=e-f(m2),得f'(n2)=1,所以(x)=e-x-a,若存在x∈[-1,1,使得f(x0)=x,等价于f(x)=x在x∈[-1,1时有解a=C-2x在x∈[-1,1时有解,设h(x)=c-2x,则h'(x)=-2易得当x∈[-1,m2)时,h(x)<0,h(x)单调递减,当∈(1n2,时,(x)>0,h(x)单邀增,所以h(x)m=h(ln2)=2-2hn2又h(-1)=e+2,h=-2,故h(x)=h(-1)=+2,所以a∈[2-2n2,1

书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

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