——The two old friends were ______ busy _____with each other ______ the time.——Yes. They haven't met for long.
A：too, to talk, to forget
B：too, talking; to forget
C：so, to talk, that they forgot
D：so, talking, that they forgot
郑州市白昼时间最短的一天是 （ ）
实验室制取并用排水法收集氧气的主要步骤有：
①装入药品；②检查装置气密性；③给固体药品加热；④将装置固定在铁架台上；⑤熄灭酒精灯；⑥收集气体；⑦将导管移出水槽．正确的操作顺序为（ ）
