A:①
B:①②
C:①②③
D:①②③④
(Ⅰ)求角A的大小;
(Ⅱ)若b+c=4,△ABC的面积 S=3 ,求a的值.
下列加横线字的注音、字形无误的一项是( )
The students decorate the classroom _____ colorful lights and stars. It looks beautiful.
Mom, _____________ my good friends, Mike and Bob.