单选题 A scientist interested in adding to our general knowledge about oxygen would probably call his approach ______.

【正确答案】 C

【答案解析】第四段中讲到“aimed at satisfying curiosity，is referred to as pure science．”，即旨在满足求知欲的科学方法叫做纯科学，因此，增加我们在氧气方面的知识属纯科学的范畴。