(B)    The latest reform in testing is the computerized test.Test questions and answer choices are presented on the    55    and students can answer with a tap of the keyboard or a click of the mouse. Before the actual test begins ,there usually is an instruction showing how to use the computer to  56  the questions. Scores are displayed on the screed at the end of the test so that a student has immediate feedback    57    having to return several days later for results.    Some computerized tests are “adaptive ”.This means that a test question is selected from a large pool of items based on how the test taker has responded to the    58    question.The first question presented is of medium difficulty .If the test taker answers    59    ,the next item will be more difficult. If he or she answers incorrectly ,the next question will be easier.The computer    60  questions by level of difficulty and many other  factors such as sex,race and age references ,subject area the question is drawn from ,and form of question ,before presenting it on the screen.In this way ,the questions are “adapted ”to find the true skill    61  of the test taker.    Among all the conveniences of computerized testing ,there are some  62  .No longer can you have a quick look at the    63    test ,answer the easy questions first ,and come back later to finish the difficult ones.Test items are persented one at a time ,and you must choose an answer in order to move on to the next question .Once you have confirmed your answer ,you cannot go back to  64  it if ,later on ,you realize that your answer was wrong .