(单选题)

What do we know about the smart shopping carts?

A.They are linked to the cameras fixed in the ceilings.

B.They can tell customers where to find what they want.

C.They flash the green light when the order is cancelled.

D.They are able to recognize purchases placed in them.

参考答案：D

参考解析：

细节理解题。根据第二段第四句These companies have added cameras and sensors to the carts, and are using AI to tell what you’ve placed in them.可知，这些公司已经在购物车上增加了摄像头和传感器，并利用人工智能来告诉你在购物车中放了什么，由此可知购物车能够识别放置在他们里面的商品。故选D。

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