下列说法正确的是（　　）

A．检验产生的气体是否是CO₂，可用燃着的木条

B．检验集气瓶中是否收集满CO₂，可用澄清的石灰水

C．要除去CO₂中少量的CO可用点燃的方法

D．区分CO₂和CO两种气体可用灼热的氧化铜或澄清的石灰水或紫色石蕊试液

In a recent experiment, a high school English teacher interspersed real, commonly used proverbs with several nonsensical proverbial-sounding statements that he had made up. He then asked his students to evaluate all of the statements on the list. In general, the students found the bogus proverbs and the real proverbs to be equally full of wisdom and meaning. The teacher concluded that proverbs attain their status as proverbs more through frequent usage than through their inherent wisdom.
Which one of the following, if true, would most effectively challenge the teacher’s conclusion

A．Some proverbs are used more frequently than others.

B．There were more real proverbs than bogus proverbs in the list of statements.

C．There are stylistic differences between proverbial and proverbial-sounding statements.

D．Some students view a statement in one way and other students view the same statement in a very different way.

E．(E) The students selected as evaluators were too inexperienced to judge the wisdom of the statements.