Three children in every classroom have a diagnosable mental health condition. Half of these are behavioural disorders, while one third are emotional disorders such as stress, anxiety and depression, which often become outwardly apparent through self-harm. There was an astonishing 52 per cent jump in hospital admissions for children and young people who had harmed themselves between 2009 and 2015.    

    Schools and teachers have consistently reported the scale of the problem since 2009. Last year, over half of teachers reported that more of their pupils experience mental health problems than in the past. But teachers also consistently report how ill-equipped they feel to meet pupils’ mental health needs, and often cite a lack of training, expertise and support from the National Health Services (英国国家医疗服务体系).

    Part of the reason for the increased pressure on schools is that there are now fewer ‘early intervention (干预)’ and low-level mental health services based in the community. Cuts to local authority budgets since 2010 have resulted in a significant decline of these services, despite strong evidence of their effectiveness in preventing crises further down the line. 

    The only way to break the pressures on both mental health services and schools is to reinvest in early intervention services inside schools.

    There are strong arguments for why schools are best placed to provide mental health services. Schools see young people more than any other service, which gives them a unique ability to get to hard-to-reach children and young people and build meaningful relationships with them over time. Recent studies have shown that children and young people largely prefer to see a counsellor in school rather than in an outside environment. Young people have reported that for low-level conditions such as stress and anxiety, a clinical setting can sometimes be daunting (令人却步的).

    There are already examples of innovative schools which combine mental health and wellbeing provision with a strong academic curriculum. This will, though, require a huge cultural shift. Politicians, policymakers, commissioners and school leaders must be brave enough to make the leap towards reimagining schools as providers of health as well as education services.

解析：D。根据题目中的cultural shift可定位至最后一段第二句。该句指出，这需要巨大的文化转变，接着对其进行解释：各方力量都必须有足够的勇气向前迈出一大步，即学校重新定义为健康和教育服务的提供者，由此可知，这里的文化转变指的是学校定义的改变，D项表述符合文意，因此选D。

错项排除：A、B项利用最后一段出现的academic curriculum和policymakers进行干扰，但文中说的是一些学校将心理健康、福利保障与强大的学习课程相结合，以及政策制定者应该勇敢迈出一步，与A项的简化学习课程、B项的家长参与学校决策无关，故A、B项均可排除。文中并未提及C项中老师对心理健康的态度转变，故排除。