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

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问题 (72)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、program

答案A

解析 译文:标识符是由字母或数字构成的序列,其第一个字符必须是字母。
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