单选题 Textbook writing should comply with principles of interest，flexibility and openness，develop-ment and expansibility，science and__________.
【正确答案】 D
【答案解析】[解析]教材编写原则包括发展性和拓展性原则、科学性原则、思想性原则、趣味性原则、灵活性和开放性原则。