Did it _______ you half an hour _______ this newspaper?
A:take; to read
B:cost; to read
C:use; to read
D:take; reading
①△DFE是等腰直角三角形;②四边形CDFE不可能为正方形,③DE长度的最小值为4;④四边形CDFE的面积保持不变;⑤△CDE面积的最大值为8.
其中正确的结论是( )