题目内容:
TheauthormentionsbigcitiessuchasTokyo,SingaporeandParis__________. A.toshowthatcitypeopleallovertheworldhavealotincommon
B.tolethisreadersbeawarethattheyaresomeoftheworld'sbiggestcities
C.toillustratetheirdifferencefromAmericancities
D.becausetheyaresomeofthecitiesthatattractvisitorsmost
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