“Ladies and gentlemen” is a social formula often used at the start of a speech.

A.a fixed arrangement of words, esp. as used on social, legal or ceremonial occasions

B.a group of letters, numbers, or other symbols which represents a scientific or mathematical rule

C.a method, plan, or a set of principles worked out to achieve a desired result

D.null

正确答案：a fixed arrangement of words, esp. as used on social, legal or ceremonial occasions