问答题

条形码的定义？

答案：条形码是将宽度不等的多个黑条和空白，按照一定的编码规则排列，用以表达一组信息的图形标识等。

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在C#中定义接口时，使用的关键字是（）。
A、interface
B、class
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From Alex, we know that, in some amusement parks, if someone does not want to stand in the long lines of the popular rides, he can pay some extra money _______.

A．to ask others for help
B．to negotiate with others to jump up to the head of the line
C．to jump up to the head of the line
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