(67)is a sequence of letters and digits, the first character must be a letter.

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问题 (67)is a sequence of letters and digits, the first character must be a letter.

选项 A、An identifier
B、A string
C、An array
D、A program

答案A

解析 译文:标识符是一个由字母和数字组成的字符序列,它要求首字符必须是字母。
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