题目

（1）在充满CO2的铝制易拉罐中加入过量NaOH溶液后封口，易拉罐立即变瘪，原因 是_______________________________________；一会儿易拉罐又鼓起，因Al与NaOH溶液反应生成H2和NaAlO2，该化学方程式为_____________________________ 。 答案：C02气体能与NaOH溶液反应而被吸收，使罐内气压减小；2Al+2H2O+2NaOH===2NaAlO2+3H2↑用所给词的适当形式填空。【1】Why _____ (do) Lucy stay in bed today?【2】Mike _____ (watch) TV in the evening every weekend.【3】Lily has a cold. She should _____ (drink) some warm water.【4】There _____ (be) some eggs in the fridge.【5】We should brush our _____ (tooth) every day.