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.(2003年3月中国科学院考博试题)
【正确答案】
C
【答案解析】解析：本题的空格处是说谈话变得好像是拉家常(some minor domestic matter)。C项的“casual随便的”符合题意，如：The casual newspapers readers 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。)其他三项“crucial关键的；central中心的，主要的；causal原因的，因果的”都不正确。