单选题 According to the introduction, we become aware of the importance of smell when
A．we discover a new smell.
B．we experience a powerful smell.
C．our ability to smell is damaged.
D．we are surrounded by odours.

【正确答案】 C

【答案解析】[解析] 题目首先说According to the introduction，直接为题目进行了定位，做题时可直接看引言段。引言段的意思是说只有当失去嗅觉时才会觉得其珍贵，其中impair是“损坏”的意思。正确的选项显然是C。
[干扰项] 本题只要理解知道原文的意思，其他三项错误选项对正确答案的干扰性并不强，而且三个错误选项有些不着边际，从逻辑上也说不通。