Interpret the final sentence: is it optimistic or pessimistic?

解释最后一句话：是乐观还是悲观？

同一单元的其他句子

• Critical reading involves analyzing the author's argument and evidence.批判性阅读涉及分析作者的论点和证据。
• How do you distinguish between facts and opinions in a text?你如何区分文本中的事实和观点？
• Do not skim the passages; instead, engage deeply with the content.不要略读段落，而要深入理解内容。
• Identify the main idea and supporting details in each paragraph.找出每段的主要思想和支持细节。
• The author's tone can be inferred from the choice of words.作者的语气可以从用词中推断出来。