Why does the author mention 'a small flat-screen device' in the first paragraph

Câu hỏi :

Why does the author mention "a small flat-screen device" in the first paragraph? 

A. to exemplify the e-cash system

B. to praise the e-cash system

C. to criticize the e-cash system

D. to inform the e-cash system

* Đáp án

A

* Hướng dẫn giải

Dẫn chứng: Even now, in Japan thousands of transactions, from paying rail tickets to picking up the groceries, take place every day with customers passing their handsets across a small flat-screen device.

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