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选出应填入下面一段英语中______内的正确答案。 The task at hand now is to (1) the programmers who still use yesterday's software technology to solve today's software problems. Object-oriented programming requires a new attitude toward problem (2) . Problem (2) with computer system becomes more natural. Application can (3) be translated into (4) . It is commonly believed that it will be easier to train new programmers to use object-oriented techniques than to (5) programmers who have substantial experience in applying conventional programnung language constructs.