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例1(2003年福州市中考题)小明用如图1装置进行“人体呼出的气体中的CO_2是否比吸入的空气中的CO_2含量多”的探究实验.实验操作及现象如图1所示:
Example 1 (2003 Fuzhou Examination Questions) Xiaoming uses the device shown in Figure 1 as an example to explore whether CO2 in the exhaled gas from the human body is more than the CO2 content in the inhaled air. Experimental operations and phenomena are shown in Figure 1. Show: