(单选题)

What does “it” refer to in Paragraph 5?

A.The mat-based gait-recognition system.

B.The gait stored in the database.

C.The advantage of working in any light condition.

D.The admission to a particular place.

参考答案：A

参考解析：

词义猜测题。该题可定位到第五段第一句“A mat-based gait-recognition system has the advantage that it would work in any lighting conditions—even pitch-darkness”，整个段落都谈论的是垫子步伐识别系统，它的好处是在黑暗条件下也可以使用，穿细高跟鞋可能有时候无法识别，但也很难模仿某人的走路习惯来骗过“垫子步伐识别系统。”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