题目

小华设计了如图1所示的甲、乙两种装置来探究“冰熔化时温度变化规律”． ①实验室常用温度汁是利用液体的 性质制成的，小华某一时刻观察到温度计示数如图2所示，该温度值为℃．②该实验应选用（“大冰块’或“碎冰块”）来进行实验，效果更好些；③为了使试管中的冰受热均匀．且便于记录各时刻的温度值，小华应选用图1中的（“甲”或“乙”）装置来进行实验． Not until ________ at school did he realize that he had left his book at home． [　　] A． he arrived B． did he arrive C． he would arrive D． would he arrive