铝电解化学反应主要方程式是（）A、2Al2O3+3C=4Al+3CO2 B、2Al+

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问题单项选择题

铝电解化学反应主要方程式是（）

A、2Al₂O₃+3C=4Al+3CO₂

B、2Al+3CO₂=Al2O₃+3CO

C、2AlF₃+3H₂O=Al₂O₃+6HF

D、Al₂O₃+3C=2Al+3CO

答案

参考答案：A

选择题

The fact suggested that the water _______ and to prevent this from happening again, John Snow

suggested that the source of all the water supplies ______.[ ]

A. should blame; should be examined

B. was to blame; be examined

C. was blamed; were examined

D. was to be blamed; should examine

填空题

每年在南宁举办（）擂台赛和（）美食节。