【正确答案】 B

【答案解析】解析：context n．上下文，语境(如：You can often tell the meaning of a word fromits context．An idiom is best learned in context．We should try to see the matter in its historical context．)。condition n．(先决)条件；(pl.)环境。circumstance n.(与某个人物或事件相联系的)条件，情况；(pl.)境遇，经济状况。environment n．环境，自然环境，周围状况。