49. Put the paragraphs into the correct order, with the given topic sentence below.[Topic sentence] Although online courses have advantages, face-to-face courses are still essential for several reasons.________________________________.A One of the most important reasons is that face-to-face courses encourage more social interaction.B For example, in some science courses, it is a must for students to conduct experiments in the laboratories.C This helps students develop interpersonal communication skills which are vital for the real job market.D To sum up, although online learning is a recent trend for education, it still cannot replace face-to-face courses.E Another reason is that some courses require hands-on experiences in a physical classroom.(A) ABCED(B) ACEBD(C) BCAED(D) BDEAC