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

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

(67) A.An identifier

B.A string

C.An array

D.A program

参考答案:

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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