Song Ying is ________ kind that she has donated almost all her savings to a charity.
A:very
B:so
C:much
D:such
山脉是地形的“骨架”,读图回答:图中①表示的山脉是( )
在△ABC中,角A、B、C对应的边分别是a、b、c,已知3cosBcosC+2=3sinBsinC+2cos2A.
(I)求角A的大小;
(Ⅱ)若△ABC的面积S=53,b=5,求sinBsinC的值.