单选题：教师要适应时代发展需要，拓宽知识视野，更新知识结构不断提高专业素养和教育教学水平，就必须（　　）。

题目内容：
教师要适应时代发展需要，拓宽知识视野，更新知识结构不断提高专业素养和教育教学水平，就必须（　　）。 A．爱岗敬业
B．勇于创新
C．严谨治学
D．终身学习

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答案解析：

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已知P是r的充分条件而不是必要条件，q是r的充分条件，s是r的必要条件，q是s的必要条件，现有下列命题：①s是q的充要条件；②P是q的充分条件而不是必要条件；③

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