1. (2022高二下·上海期中) Directions: Complete the following passage by using the words in the box. Each word can only be used once. Note that there is one word more than you need.

A. build     B. precisely   C. reason   D. reinvent   E. relative  F. social G. survive   H. theoretically  I. traces   J. transmission    K. works

Three things that make us human

All species on Earth, including humans, are unique. Yet our intelligence and creativity go well beyond those of any other animal. Humans have long communicated through language, and invented ever more complex tools that have enabled our species to and develop.

>Our brains

Without doubt, the human trait （特征）that sets us apart the most from the animal kingdom is our extraordinary brain. Humans don't have the largest brains in the world—those belong to sperm whales. We don't even have the largest brains to body size—many birds have brains that make up more than 8% of their body weight, compared to only 2. 5% for humans. Yet the human brain, which weighs about three pounds when fully grown, gives us the ability to and think on our feet beyond the capabilities of the rest of the animal kingdom. It gave us the of Einstein, Mozart and many other geniuses.

>Language

Many species communicate with vocal sounds. But language is a special form of communication. Full language, with rules for combining sounds into words, and words into sentences, probably originated at some point about 50,000 years ago. But we will probably never know when and where language originated. Fossils, DNA evidence, comparisons with other animals, and studies of how languages change over time all provide clues, but spoken language itself leaves few . It most likely evolved from a simpler form of communication. Chimpanzees use both gestures and vocal calls to communicate status and other complex 3 information. It is possible that our ancestors also expressed themselves first with gestures or simple words, then developed rules for linking them into sentences.

A Learning from each other

Our unique brains and dexterity(灵巧)of our hands use of tools possible, but we also rely on the cultural of ideas. Culture is at the heart of being human. We put our heads together, we share ideas, and learn from each other, recognizing a past, a present, and a future. We learn from the past, on this in the present, and expect the future. Without culture, each new generation would be forced to the wheel.