17. Thousands of years ago, people didn't live in cold places because they don't know how to keep themselves warm. (1)
When an animal was killed, they made use of its skin to cover (覆盖) their bodies. (2)
Nature is our friend. It helped us discover (发现) fire when lighting hit a forest and stared a fire. (3)
The fire kept people warm, and also frightened (吓跑) wild animals.
Soon people found that their food tasted better when they cooked it, so they began to use fire to cook food.
But people still didn't know how to make fire themselves. When they get fire from the forest, they tried to keep it burning. (4)
But later, they found different ways to make fire. For example, they made fire by burning wood or rubbing two pieces of stone together.
Today, it's easy for people to make fire because we have matches, lighters and different kinds of heaters. (5)
A. If it went out, they had to wait for years. B. The skin kept them warm. C. We can make fire at any time we need. D. People took some of this fire to their homes. E . Later, they learned how to make clothes. |