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简述补子的作用和意义。
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【D2】DIANA: LOOK AT THOSE STRANGELY-DRESSED KIDS. WHAT ARE THEY DOING THERE? ARTHUR: DON"T YOU KNOW? TODAY IS THE HALLOWEEN DAY.【D1】______OCTOBER 31ST. THE LAST DAY IN OCTOBER IS A HOLIDAY FOR KIDS. WE CALL IT HALLOWEEN. DIANA: HALLOWEEN! I HEARD IT BEFORE, 【D2】______ ARTHUR: CHILDREN CELEBRATE IT BY MAKING LANTERNS THAT NIGHT. DIANA: PARDON? ARTHUR: THOSE ARE LANTERNS MADE OUT OF FRESH PUMPKINS WITH A CANDLE BURNING INSIDE. DIANA: TODAY I SAW SOME IN THE STREET WITH CARVED FACES ON THEM. ARE THEY ALL MADE BY CHILDREN? ARTHUR:【D3】______YOU KNOW, IT IS TOO HARD FOR THEM TO DO IT BY THEMSELVES. SOMETIMES THEY ARE AVAILABLE IN VARIOUS SHOPS TOO. DIANA: THEY ARE FASCINATING. ARE YOU GOING TO ANY HALLOWEEN PARTY TONIGHT? 【D4】______ ARTHUR: NO PROBLEM. A. PARENTS USUALLY HELP THEM.B. THE KIDS ARE GOING TRICK-OR-TREATING.C. BUT I DON"T KNOW HOW IT IS CELEBRATED.D. IF YOU GO, TAKE ME WITH YOU.
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