How does the passage support its claim about digital media's impact on attention spans?

这段文章如何支持其关于数字媒体对注意力跨度影响的论点？

同一单元的其他句子

• Reading comprehension requires understanding the author's main argument.阅读理解需要理解作者的主要论点。
• Have you analyzed the tone of this passage?你分析过这篇文章的语气吗？
• The article discusses the impact of technology on education.这篇文章讨论了技术对教育的影响。
• Do not skim the text; read every detail carefully.不要略读文本，仔细阅读每个细节。
• Inference questions often require reading between the lines.推理题通常需要体会言外之意。