题干
听第二段对话，回答第7题。
Where is the school?
A：It's behind the bank.
B：It's next to the bank.
C：It's in front of the bank.
答案(点此获取答案解析）
B
3HNCO； 8HNCO＋6NO2
7N2＋8CO2＋4H2O