10.
如图,AB、CD、MN均为直线,AB∥CD,∠GFC=80°,GH平分∠MGB,则∠1的值为( )
0 282885 282893 282899 282903 282909 282911 282915 282921 282923 282929 282935 282939 282941 282945 282951 282953 282959 282963 282965 282969 282971 282975 282977 282979 282980 282981 282983 282984 282985 282987 282989 282993 282995 282999 283001 283005 283011 283013 283019 283023 283025 283029 283035 283041 283043 283049 283053 283055 283061 283065 283071 283079 366461
| A. | 35° | B. | 40° | C. | 45° | D. | 50° |