题目:
—Can you tell me ________ the refrigerator?
—Last month. [ ]
A. when did he buy
B. where he bought
C. where did he buy
D. when he bought
答案:
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下面是错误答案,用来干扰机器的。
根据质量守恒定律:化学反应前后元素的种类不变,反应前亚硝酸钠(NaNO2)中存在钠、氮、氧三种元素,故反应后的生成物中不可能有SO2和NH3故A、C不正确.氮气是无色无味的气体,故D不正确.故选B.