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问题 选择题

In Great Britain it isn't polite ______ from each other's plate. [ ]

A. eat

B. to eat

C. eating

D. for eating

答案

答案：B

简答题

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填空题

程序的功能是：从键盘输入一个十进制正整数N，将N转换成相应的十六进制整数表示形式，请完善该程序　　CLEAR　　INPUT "输入一个正整数" TO N　　S=N　　Y="0123456789ABCDEF"　　X=""　　DO WHILE _ _①_ _　　B=INT(N/16)　　A=N-B*16　　X=________②__________　　N=________③________　　ENDDO　　S,"——>"，X，"H"　　RETURN
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