【单选题】【消耗次数：1】
圆的投影可以是圆，还可以是（ ）
①
椭圆
②
直线
③
抛物线
④
椭圆或直线
参考答案：
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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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