What is the meaning of “serve its purpose” and “every step of the way” in the sentence “From animal skin to linen， from cambric（麻布） to silk and cotton and to the various kinds of materials today， innovation served its purpose every step of the way.”
What is the meaning of “serve its purpose” and “every step of the way” in the sentence “From animal skin to linen， from cambric（麻布） to silk and cotton and to the various kinds of materials today， innovation served its purpose every step of the way.”
A.play its role / throughout the process
B.provide people with something they need / with all the sequences of foot movements
C.provide service / in somebody’s way
D.perform a particular function / along the flat surfaces in one' s way
正确答案：play its role / throughout the process