is a new kind of store with no checkout required"可知，Amazon Go便利店无需在收银台结账，故A项正确。

　　2．What is mainly discussed in Paragraph 3?

　　A．When Amazon Go charges.

　　B．How Amazon Go works.

　　C．Where Amazon Go lies.

　　D．What Amazon Go sells.

　　答案与解析：B　考查段落大意。通读第三段可知，该段主要介绍了无人收银的技术原理，即类似于无人驾驶汽车的技术；还介绍了顾客付款的技术原理。据此可知，该段主要介绍Amazon Go便利店的运作原理，故B项正确。

　　3．Customers pay for the products from Amazon Go by ________.

　　A．paying cash at the counter

　　B．walking out of the store

　　C．using their Amazon accounts

　　D．scanning smartphones when leaving

　　答案与解析：C　考查细节理解。根据第三段最后一句"Shortly after, we'll charge your Amazon account and send you a receipt"可知，在顾客离开后，Amazon Go会通过亚马逊账户收取顾客的费用，故C项正确。

　　4．The main purpose of the passage is to ________.

A．encourage people to shop online