句子写作：”Happy Christmas “he said.
“Happy Christmas “he said, smiling and picking out two flowers.
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Howmanypartsdoesascienceandtechnologypaperconsistof?Whatarethey?
Thereistheappreciationofthesalienthistoricaltruth________theagingofadvancedsocietieshasbeenasuddenchange
句子写作：”HappyChristmas“hesaid.
Whataretheparagraphqualities?
句子写作：Thepianoplayerbegantosingloudly.