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答案：
E
点（x,y）属
于L这条线下面，那么x y满足哪个不等式？
先把Line L的关系式求出来：
两点：y=kx+b b=3 k=-1/2
所以y=-1/2x+3
既然那点都在线下面
那就是y<-1/2x+3 
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