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Which is better, one-time or compulsory?
One-time exercises and compulsory exercises are common teaching AIDS for middle school students, which are slightly different in content and difficulty. Pay more attention to the depth and comprehensiveness of knowledge over and over again, and the topic is more difficult; Mandatory questions pay more attention to the diversity and coverage of the questions, and the difficulty of the questions is moderate. When choosing, it is suggested to choose the appropriate teaching AIDS according to your own learning situation.