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5.D【解析】转化[文]I中，KO2的O元[章]素化合价既有升高又[来]有降低，故KO2既[自]是氧化剂又是还原剂[知]，A项正确；转化Ⅱ[嘛]中，若Na2O2不[答]足，最终可能只有N[案]a2O2与CO2反[网]应生成Na2CO3[文],B项正确；Na2[章]O2和KO2均为离[来]子晶体，其熔点均主[自]要取决于晶格能，C[知]项正确；由反应方程[嘛]式可得关系式：2N[答]a2O2~O2、4[案]KO2~3O2,则[网]等质量的Na2O2[文]和KO2完全反应，[章]Na2O2放出氧气[来]的质量小，D项错误[自]。
书面表达One possible versionDe[知]ar DavidI have lived in America for a month. but I still find it difficult[嘛] to adapt myself to a few things around me. I hope you would bekind enough to give me some help on the following[答] problems.[案]To begin with, I am not accustome[网]d to the western food that tastes very different[文] from Chinese food. Besides, I find I can't fit inwith others here because it is hard for me to catch up with what the local people say. What's worse. I have no friends here, so I feelI wonder how to deal with all these problems.[章] I will be grateful if you can spare time to do me a favor. Please reply to me soon.Your[来]s.Li Hua
