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已知有如下语句： s＝'hello, world' r=Mid(s，7，5) 运行上面的语句后，变量r的值为 ( )
D.orld

A.hello
B.wotld
C.llo,w

【参考答案】

B
解析：Mid(s，7，5)表示从字符串 s中的第7位开始向右取出5个字符。题中s为'hello，world'，故执行语句r=Mid(s，7，5)后，变量r的值应为'world'。
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