(单选题)

What is said to be a shortcoming of facial-recognition machines?

A.They cannot easily tell apart people with near-identical appearances.

B.They have difficulty identifying changes in facial expressions.

C.They are not sensitive to minute changes in people's mood.

D.They have problems distinguishing people of the same age.

参考答案：A

参考解析：

细节理解题。根据第五段第一句“Machines also had difficulty adjusting for people who look a lot alike—either doppelgangers，”可知，面部识别机器在辨别长得很像似的人时存在很大的困难，得出这也是它的一个缺点。A项表述正确；根据第七段第一句“The trouble is, for many of the researchers who’d like to design systems to address these challenges, massive datasets for experimentation just don’t exist，”可知，对于许多想要设计系统来解决这些挑战的研究人员来说，用于实验的大规模数据集根本不存在。所以B项、C项和D项并未涉及，错误。故选A。

知识点：阅读理解四选一英语专业基础知识阅读理解教师招聘-小学英语