【单选题】【消耗次数：1】
下面叙述正确的是( )?
①
可以把define和if定义为用户标识符
②
可以把define定义为用户标识符，但不能if定义为用户标识符
③
可以把if定义为用户标识符，但不能define定义为用户标识符
④
define和if都不能定义为用户标识符
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<imgwidth="38"height="15"v:shapes="图片_x0020_115"src="http://wljy.whut.edu.cn/uploadfiles/word/cyy01-60.files/image118.png">
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