题目

Mum, could you buy me a dress like this? --- Certainly, we can buy _____than this, but _______this. A. a better, better than              B. a worse, as good as C. a cheaper, as good as             D. a more important, not as good as 答案： C已知|a|=3，b2=2，且ab＜0，则a+b= ．