（）may prove extremely valuable in guessing the meanings of new w

（）may prove extremely valuable in guessing the meanings of new words.
A、Grammar
B、Context
C、Pronunciation
D、Ambiguity
【正确答案】：B
【题目解析】：本题考查语境的作用。 语境可以提供线索，用来猜测新词的意义。 grammar：语法；context：语境；pronunciation：发音；ambiguity：歧义。故答案为B。