Because the films will give you a good idea of the kind of language people use today.
题干:如果你想提高你的英语水平,为什么要关注最近的电影呢?
根据第二段第2-4行However, if you're watching them to improve your English, it will be much more helpful to choose films from the past few years that are set in the modern day. This will give you a good idea of the kind of language people use today!(然而,如果你看这些电影是为了提高你的英语水平,那么选择过去几年以现代为背景的电影会更有帮助。这会让你对今天人们使用的语言有一个很好的了解!)可知,最近的电影能让我们对今天人们使用的语言有很好的了解。
故答案为:Because the films will give you a good idea of the kind of language people use today.