Question

【题目】The robot has a speaker _______ a mouth.

A. for B. as C. on D. being

Answer 1

【答案】B

【解析】句意：这个机器人有一个扬声器当嘴。for为了，as作为；on在……上；being是。结合句意，扬声器充当嘴的功能，故用介词as，故选B。