2022년 EBS 수능완성 17강 장문의 이해1

2022년 EBS 수능완성 17강 장문의 이해1 생각하는영어 [Let's Check it Out] 다음 글을 읽고, 물음에 답하시오. Early trade may have started as mutual gift-giving, as still occurs in a modern society when we celebrate each other’s birthdays, or bring wine when invited for dinner.

Over time, this gift-giving might have become more systematic. Both parties would have realised that they (a) gain from the process.

In the case of the apples/eggs swap, each gets a more varied diet. Over time, this leads to (b) specialisation.

For some go...