She has two daughters,____ ____ ____ is a doctor.
鼎:A.古代烹煮用的器物,一般是三足两耳;B.大;C.正当,正在。
人声鼎沸____ 鼎鼎大名____
函数y=log22sin(2x﹣π3)+2-x2的定义域为____