lesson from this question:
In a weaken question, if a comparision between 2 objects is present, the correct answer may have nothing to do with the object that is ot covered in the conclusion. Here, B is all about the ebook, not the printed book. => pay attention to the main premise and the main conclusion.
In a weaken question, if a comparision between 2 objects is present, the correct answer may have nothing to do with the object that is ot covered in the conclusion. Here, B is all about the ebook, not the printed book. => pay attention to the main premise and the main conclusion.





