正确答案为E
第一种情况是两条线平行,另外两条线也平行,这样就有四个交点
第二种情况是两条线平行,第三条线和第四条线在一点与第一或第二条线相交,这样就只有三个交点
第三种情况为两条线平行,第三条线和第四条线不平行,这样就有五个交点
建议画下图就很简单了
不好意思,如果C答案是3 and 1 only,正确答案就应该是C
因为题目中说“exactly two of them are parallel”,就可以排除我上面说的第一种情况（四个交点）.所以答案为三个和五个交点,即1与3（C）
Four distinct lines lie in a plane,and exactly two of them a
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