add 1 exercise and 2 pics from sunrise
Merge branch 'sunrise_1209ok'
修改【20141216】——area_of_a_circle2
Merge branch 'sunrise_1216_area_of_a_circle2'
修改【20141205】——adding_subtracting_carry_3
Merge branch 'sunrise_adding_subtracting_carry_3'
修改【20141205】——volume_unit_conversion
Merge branch 'volume_unit_conversion'
修改【20141205】——concepts_related_to_kite
Merge branch 'concepts_related_to_kite'
comparison_between_numbers_within_ten spanner圖片丟失
Merge branch 'comparison_between_numbers_within_ten'