With the help of the teacher, he decided _______ in class.
A:not to talk
B:to not talk
C:talk
D:not to talking
在极坐标系中,曲线ρ=4cosθ围成的图形面积为( )
写出zcs三个声母与韵母i的四声合拼的音节。
z: ____ ____ ____ ____
c:____ ____ ____ ____
s:____ ____ ____ ____