单选题
In the last few minutes the conversation has become seemingly ______as if the discussion were of some minor domestic matter and not survival itself. A．crucial B．central C．casual D．causal
【正确答案】
C
【答案解析】[解析] C选项casual(随便的)符合题意，如：The casual newspaper reader wouldn’t like long articles on serious subjects every day．(随便看看报纸的人不愿每天看那些有关严肃主题的长文章。)A选项crucial(关键的)、B选项central(中心的，主要的)、D选项causal(原因的，因果的)都不正确。本题的空格处是说谈话变得好像是拉家常(some minor domestic matter)。因此C选项为正确答案。