A:How far
B:How often
C:How much
D:How long
下列说法中正确的是( )
函数f(x)=sin(π-x)-3sin(π2+x)图像的一条对称轴为( )
A:Look! This is the flag of ____. Do you know?
B:Yes, I ____ about it. It has five yellow stars.
A:What is the capital ____ of China?
B:It's Beijing. Tian'anmen Square is in Beijing. It's ____ .
A:What do you ____ ?
B:Chinese.
A:Great!