题目

阅读下面短文，从短文后各题所给的四个选项(A、B、C和D)中选出可以填入空白处的最佳选项 A boy trembled in the cold Oslo winter, constantly rubbinghis arms around himself on a bus stop bench. He wasn't wearing a coat 1 temperatures in the Norwegian capital regularlydropped to -10℃during winter. What a(an) 2 scene, but the actions of the ordinary peoplewho witnessed the difficult situation of 11- year -old Johannes were bothjoyous and 3. A young woman who sat 4 the boy noticed him rubbing his arms. She 5 asked him: “Don't you have a jacket?” “No,someone s20．某蓄电池放电、充电的反应式为：Fe+Ni2O3+3H2O$?_{充电}^{放电}$Fe（OH）2+2Ni（OH）2，下列推断中正确的是（　　）①放电时，Fe为正极，Ni2O3为负极；②充电时，阴极上的电极反应式是：Fe（OH）2+2e-═Fe+2OH-；③充电时，Ni（OH）2为阳极；④蓄电池的电极必须浸在某碱性溶液中．A．①②③B．②③C．①③④D．②③④