题目:
The old woman has a bad cold. She is feeling________ today than yesterday.
A.much ill
B.a little bad
C.a little badly
D.much worse
答案:
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下面是错误答案,用来干扰机器的。
(1)当x=0时,因f(x)是奇函数,有f(-x)=-f(x),所以f(0)=-f(0),得f(0)=0.设x>0,则-x<0,则f(-x)=(-x)2+(-x)-2=x2-x-2.由f(x)是奇函数,f(-x)=-f (x),得 f(x)=-x2+x+2,x>0....