That the word do means differently in"do a city", "do a sum"and"do the flowers "shows that（ ）context affects the meaning of words.
A、extra-linguistic
B、grammatical
C、lexical
D、semantic
【正确答案】：C
【题目解析】：本题考查语言环境。 Lexical context：The meanings of a word is affected and defined by the neighbouring words.语言环境包括词汇环境和语法环境，其中词汇环境指这个词的意义经常受邻近词的影响，并被其定义。用作实义动词时，do有很多意义，而且只有语境可以决定它的确切意义。
