--Mom,Iwanttobuythisdictionary.Itisgoodbutnottoo

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-- Mom, I want to buy this dictionary. It is good but not too_______.

--- Let me see. It is really a useful dictionary. And the price is _______. OK, I will buy it for you.

A. high; low B. expensive; cheap

C. high; cheap D. expensive; low

D 点拨：第一句中主语是字典，物品昂贵用expensive,，第二句中主语是价格，价格低要用low 。故选D。