39. 글의 흐름으로 보아, 주어진 문장이 들어가기에 가장 적절한 곳은?
[this hasn’t escaped the attention of some savvy internet retailers and we are therefore starting to see the emergence of social shopping sites.]

e-tail is obviously a massive trend but in many ways online shopping is still divorced from the real world. ( ① ) online supermarkets are usually just text-based lists of products ― you can’t walk through the store. ( ② ) indeed, despite the convenience factor, online shopping has nothing in common with its real-world equivalent. ( ③ ) for example, online you generally have to know what you’re looking for and most people shop alone. ( ④ ) in the real world, however, shopping is more of an event, an experience that is usually shared, and customers listen to the recommendations of friends and trusted experts. ( ⑤ ) these are a mixture of search engines and social networking sites and allow shoppers to browse and buy based on other customers’ recommendations.

전체적인 내용이온라인쇼핑의 한계와 현실에서의 쇼핑이 좀더나은 현재시점에서 소셜쇼핑사이트의 등장을 알리는 내용인거죠?

여기에서 제가 빨간색으로 색칠한 부분이 뭔말인지 모르겠네요..