【单选题】【消耗次数：1】
圆柱面被平面截切后产生的截交线形状有（）。
①
圆、两平行直线和椭圆
②
圆和椭圆
③
圆、两相交直线和椭圆
④
两平行直线和椭圆
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已知椭圆4x2＋y2＝1及直线y＝x＋m.(1)当直线和椭圆有公共点时，求实数m的取值范围．(2)求被椭圆截得的最长弦所在的直线方程．
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