1. "It was a discovery that had been subtly altering the情趣 of his mind for years, a revelation that was gradually making him a different sort of animal, but an animal with more of what we call human consciousness than he had ever had before."
2. "The reasonable man adapts himself to the world； the unreasonable one persists in trying to adapt the world to himself. Therefore, all progress depends on the unreasonable man."
3. "It is a far, far better thing that I do than I have ever done； it is a far, far better rest that I go to than I have ever known."
4. "We can easily forgive a child who is still young and ."
5. "It is needless to say that learning a new language can be challenging, especially when it comes to mastering English. In order to truly excel in this language, it is essential to tackle ."
6. "This alone demonstrates that the television business is not an easy world to survive in, a fact underlined by statistics that show that out of eighty European television networks, no less than 50% took a loss in 1989."
这些句子因为它们的长度、复杂性以及包含的语法和词汇量而被认为较难。建议读者在阅读这些句子时，可以尝试分段理解，先抓住主干信息，再逐步分析修饰成分，以提高理解能力。