Which of the following underlined parts is different in pronunciation from others?

A．The host usually speaks first at a meeting.

B．Please pay attention to the missing part.

C．The old are free to take a bus when it is not the rushing hour.

D．Oh, how windy! Close the window, please.

天麻药材的加工方法是（）

A.蒸或沸水中烫至无白心，晒干

B.直接晒干

C.去皮，蒸或煮至透心，晒干

D.立即清洗，除去粗皮，蒸透心，低温干燥

E.去外皮及须根，熏硫后晒干