4.D【解析】当a<0,b>0时,可知一<0 <一,故a错误;由b2-ab=b(b-a)可知,当b<0时,b2 0.所以二2m<-20z,故D正确故选D

第二节书面表达Dear Henry,Im Li Hua from your English speaking class lastterm. I m writing to ask for your helpNow I am preparing to attend MUN next weckHowever,have some difficulty with concepts andexpressions of the current affairs and speech skills. Iwonder if I can borrow your Dictionary of englishMedia. which you presented in class. Furthermore.I amnot quite sure about how to make a convincing andpersuasive speech at MUN. Could you be so kind as to giveme some advice?I know you have a very busy schedule, but I'd be verygrateful if you could spare some time to give me face-to-acc instructions. Thank you for your kindnessI'm looking forward to your replyYoursLi Hua

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