A:g(x)=2sin2x
B:g(x)=2sin(2x+π6)
C:g(x)=2sin(2x+π2)
D:g(x)=2sin(2x+2π3)
小明为深入了解唐太宗,进行了探究性学习。下列可以为他提供有效信息的文献是( )
Tan Jin is a singer, she has a good ______.
London is the capital______England. ( )