如图,直线a∥b,直线c是截线,如果∠1=50°,那么∠2等于( )
A:150°
B:140°
C:130°
D:120°
阅读英国输华货物统计表,造成该表所反映趋势的根本原因是( )
I'll give the book to him if he _______ here next Sunday.
如图,直角△ABC内接于⊙O,点D是直角△ABC斜边AB上的一点,过点D作AB的垂线交AC于E,过点C作∠ECP=∠AED,CP交DE的延长线于点P,连结PO交⊙O于点F.