下面是2023年高考英语全国卷2的语法填空题。我不太明白为什么 date 后面没有 back，要表示“追溯到”，不是应该用 date back to 吗？这里为什么用 date to？是错了，还是这个 back 可以省略？我查了手头的所有词典，要表示“追溯到”，所有词典都只用 date back to 而没有用 date to 的：

For thousands of years, people have told fables (寓言) ___41___ (teach) a lesson or to pass on wisdom. Fables were part of the oral tradition of many early cultures, and the well-known Aesop’s fables date to the ___42___ (six) century, B. C. Yet, the form of the fable still has values today, ___43___ Rachel Carson says in “A Fable for Tomorrow. ”

Carson uses a simple, direct style common to fable. In fact, her style and tone (口吻) are seemingly directed at children. “There was once a town in the heart of America___44___ all life seemed to enjoy peaceful co-existence with its surroundings,” her fable begins, ___45___ (borrow) some familiar words from many age-old fables. Behind the simple style, however, is a serious message ___46___ (intend) for everyone.

___47___ (difference) from traditional fables, Carson’s story ends with an accusation instead of a moral. She warns of the environmental dangers facing society, and she teaches that people must take responsibility ___48___ saving their environment.

The themes of traditional fables often deal with simple truths about everyday life. However, Carson’s theme is a more weighty ___49___ (warn) about environmental destruction. Carson proves that a simple literary form that has been passed down through the ages can still ___ 50___ (employ) today to draw attention to important truths.