题目

实验是化学研究的基础，关于下列各实验装置图的叙述中，错误的是（    ） A．装置①可用于检查装置的气密性    B．装置②可用于除去CO中混有的少量CO2 C．装置③可用于安全吸收极易溶于水的氯化氢来制盐酸    D．装置④可用于排空气收集CO 答案：D—What were you doing when Tony phoned you? —I had just finished my work and________ to take a shower. A. had started                  B. started C. have started                 D. was starting