题目

 —Who is that woman on TV? — ________ pop singer, I often listen to her songs.      A. A              B. An             C.The            D. / 答案：AO为坐标原点，点P(x，y)在圆x2+y2=9上，点Q(2cosθ，2sinθ)(θ∈R)满足=(,-2)，则等于(    ) A．37          B．            C．4             D．2