单选题：以下叙述中正确的是

题目内容：

以下叙述中正确的是 A．在c语言中，逻辑真值和假值分别对应1和0
B．关系运算符两边的运算对象可以是C语言中任意合法的表达式
C．对于浮点变量x和y，表达式：x==y是非法的，会出编译错误
D．分支结构是根据算术表达式的结果来判断流程走向的

参考答案：

答案解析：

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