—How do you find your trip to Hainan?
—Lots of sunshine,wonderful food,and amazing nightlife—________a great vacation.
A:although
B:however
C:altogether
D:besides
①邯郸学步 ②唇亡齿寒 ③吐故纳新 ④青出于蓝而胜于蓝
如图,AB为⊙O的直径,弦AC=2,∠ABC=30°,∠ACB的平分线交⊙O于点D,求:
(1)BC、AD的长;
(2)图中两阴影部分面积的和.