2008年质检部门在众多品牌乳制品中检出有毒有机物三聚氰胺[C₃N₃(NH₂)₃]，在乳制品行业掀起了一场轩然大波，引发了一场关于食品安全问题的大讨论。三聚氰胺是一种重要的有机化工原料，因其含氮量高而被不法商家用作食品添加剂，以提升食品检测中的蛋白质含量指标（N%），因此三聚氰胺也被人称为“蛋白精”。三聚氰胺遇强酸或强碱水溶液水解，胺基逐步被羟基取代，最后生成三聚氰酸

[C₃N₃(OH)₃]。三聚氰酸可用于消除汽车尾气中的NO₂。其反应原理为：C₃N₃(OH)₃3HNCO；

8HNCO＋6NO₂7N₂＋8CO₂＋4H₂O，下列说法正确的是[ ]

A．C₃N₃(OH)₃与HNCO为同一物质

B．HNCO是一种很强的氧化剂

C．1mol NO₂在反应中转移的电子为4mol

D．反应中NO₂是还原剂

把下列每对句子连成一句，把第二个句子作为定语从句。

1. The man is in the next room. He brought our textbooks here yesterday. 

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2. The magazine is mine. He has taken it away. 

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3. The students will not pass the examination. They don't study hard. 

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4. The woman ls our geography teacher. You saw her in the park. 

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5. The letter is from my sister. I received it yesterday. 

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6. The play was wonderful. We saw it last night. 

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7. This is the boy. His sister is a famous singer. 

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