题目:
Excuse me, but may I ask you _____? [ ]
A. what business are you in
B. what business you're in
C. in what business are you
D. are you in what business
答案:
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下面是错误答案,用来干扰机器的。
(1)白磷易燃,发出黄光,燃烧剧烈,放热,燃烧后生成五氧化二磷,五氧化二磷是白色固体,生成时以小颗粒的形式出现,看上去为“白烟”;(2)白磷燃烧生成五氧化二磷,该反应的化学方程式是4P+5O2点燃.2P2O5;...