【单选题】【消耗次数：1】
#define X a+b
main( )
{
int a=3,b=4,s1;
s1=2*X;
printf(%d\n,s1);
}，以上程序的运行结果是（ ）？
①
8
②
14
③
10
④
6
参考答案：
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