※ 밑줄 친 부분에 들어갈 가장 적절한 것은? [문 8～문 9] E-books obviously have certain advantages (like the fact that you can carry lots of them around with you), but for many book buyers their main appeal is that they're cheaper. Against that, the Codex Group finds that people of all ages still prefer print for serious reading; e-book sales are dominated by genre fiction―"light reading." We do read things differently when they're on a page rather than on a screen. A recent study found that people reading on a screen tended to skip around more and read less intensively, and plenty of research confirms that people tend to comprehend less of what they read on a screen. The differences are small, but they may explain the persistent appeal of paper. Indeed, ________________.