Not only John and Tom but also their sister, Mary, ______great interest in the piano lessons.

A．take

B．takes

C．have taken

D．had taken

m和n两个音发音时，（）

A、气流不从口腔通过，从鼻腔流出

B、一部分气流从口腔通过，一部分气流从鼻腔通过

C、发m时气流从鼻腔通过，发n时气流同时从口腔和鼻腔通过。