题目

空气的成分按体积分数计算：氮气约占、氧气约占、二氧化碳约占、约占0.94%、其他气体和杂质约占． 答案：【1】78%【2】1%【3】0.03%【4】稀有气体【5】0.03%He made one big mistake, and , ______, lost his job.A．in a wordB．in factC．at lastD．as a result