Betty is looking forward to ________ Disneyland with her parents.
A:go to
B:going to
C:goes to
D:went to
(Ⅰ)若a,b,c成等差数列,证明:sinA+sinC=2sin(A+C);
(Ⅱ)若a,b,c成等比数列,且c=2a,求cosB的值.
如图为哈尔滨香坊区油坊街哈利路亚教堂,圣诞节这里的广场上矗立着美丽的圣诞树,来这里祈祷的人们多信奉的宗教是( )