Last night, my parents decided _______ to Qingdao for vacation.
A：go
B：going
C：to go
D：went
①f（x）=ax•g（x）（a＞0，a≠1）；
②g（x）≠0；
③f（x）•g'（x）＞f'（x）•g（x）；
若 f(1)g(1)+f(−1)g(−1)=52 ，则a=____．
A father in the UK has a wonderful idea to send his kids to school on time. He takes his sons to school in a white tank（坦克）.
把耶路撒冷奉为圣城的宗教是（ ）
OA平分∠BOC，P是OA上任一点（O除外），若以P为圆心的⊙P与OC相离，那么⊙P与OB的位置关系是（ ）
