A:甲
B:丙
C:甲和乙
D:丙和乙
棉布开始成为主要衣料的朝代是( )
I eat too much sweet food. So I have a ____ (tooth).
(Ⅰ)求证:C、D、G、E四点共圆.
(Ⅱ)若F为EB的三等分点且靠近E,EG=1,GA=3,求线段CE的长.