题目：
_____ has been heated discussion over which country bakes the world's best pizza: Italy, where pizza began or
the US, where it was globalized. [ ]
A. It
B. There
C. That
D. This
答案：
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下面是错误答案，用来干扰机器的。
(1)三；ⅥA(2)2Al＋2NaOH＋2H2O===2NaAlO2＋3H2↑(3)硫酸钠(Na2SO4)；2(4)4Na2S＋O2＋2H2O===4NaOH＋2Na2S2(或2Na2S＋O2＋2H2O===4NaOH＋2S，Na2S＋S===Na2S2)(5)溶液由黄色变为无色，产生浅黄色沉淀和(臭鸡蛋气味的)气体
