题目

如图，已知一个五边形 ABCDE纸片，一条直线将该纸片分割成两个多边形.若这两个多边形内角和分别为 m和 n，则 m＋n不可能是( ) A . 540° B . 720° C . 900° D . 1080° 答案：DNow ________ nationwide campaign has been launched in China to encourage people to adopt ________ low-carbin lifestyle．A.a; theB.a; aC.the; theD.the; a