【正确答案】 A

【答案解析】本题是细节推断题。答案在第六段。由Simple memory tests give an indication of what you are up against and tools such as“look”and“connect”are designed to make sure...和“So if you wanted to learn names and faces，for example，you meet...eyebrow”可见此例子是针对前面的look和connect两个工具的，而通过notice a distinguishing facial feature... (注意到一个奇特的面部特征……)可推知答案为look。