题目

如图是模拟二氧化碳的实验室制法、性质的检验等的综合实验，描述错误的是（） A . 本实验过程涉及到2个化学反应 B . 2处变红 C . 3处会产生白色浑浊 D . 可以观察到石灰石表面有气泡产生 答案：A看图，将下列句子补充完整。l. They were              then. Now they are              . 2. She was fat then. Now she is               .3. She was short then. Now she is                 .4. She was four then.Now she is               .