- 问题详情:CatsanddogsarethemostpopularpetsamongAmericans.SoitisnotsurprisingthatwecanfinddifferentsentencesaboutcatsinalanguagebookwhenwelearnEnglish.Unlikedogs,itisdifficulttoteachcatstodosomething.Catsarenotlikesheeporcowsthatcanbemovedinagroup.Sowes...
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