题干
The fire started in the basement and quickly____________ to the first floor where it destroyed all the______________ in the language lab.
A：was spreaded;furniture and equipment
B：was spreaded ;furniture and equipment
C：spread;furnitures and equipment
D：spread ;furniture and equipment
答案(点此获取答案解析）
D
2Fe3++2H2O = SO42- +2Fe2++4H
+；然后再加入K2Cr2O7溶液，发生反应：Cr2O72-+6Fe2++14 H+ ="2" Cr3++6Fe3++7H2O。下列判断正确的是（ ）
