50 questions with the solution and explanation

A file containing 50 questions selected from the most frequently repeated questions in all formats for the last three professional English license exams, mainly related to the phonetics part, with solutions and brief explanations away from excessive filler to help the test-taker save time. It is written in clear language and simple style to facilitate understanding and absorption of the information (the questions and their explanations are purely personal effort; I do not allow sharing with others without permission).