Science is the best way we have of finding out about the world.Scientists collect evidence（证据）.They have ideas about the way things work.Science tests those ideas.Sometimes the test will show that the idea is not correct.If the idea passes the test，it adds to our understanding.

Scientists make observations （观察）.They may look，or listen.They may read the work of other scientists.This gives them ideas.You can do this.You can look around you.You can ask questions.You can plan a test to find out.You can discover something new.

Scientists make predictions.They say something about the future.They might say 'if I do this，then I think that will happen'.Isaac Newton was a famous scientist.When he shone white light through a glass prism，he saw a spectrum （光谱） of different colors.Newton predicted what would happen if he shone the spectrum through a second prism.He thought the colors would come together and he would see white light again.He tried it.He shone a spectrum through a second prism.He was right.The colors made white light.He discovered that white light is made up of many colors.

It's important to test your ideas.I's important to plan a fair test.A scientist wondered how a tree grows.Where does all that material come from？Was it from the soil？

He planted a young tree in a pot.He weighed the pot，the dry soil and the tree at the start of his test.Years later，the tree had grown tall.It had many branches and leaves.The scientist dug it up.He weighed it.The tree weighed far more than when it was young.Then he weighed the pot and the dry soil.It weighed just a bit less.

Where had all the new tree material come from？He decided that trees use water，and a gas from the air，to grow.

（1）According to the passage，we know that science can help us 　 　.

（2）We can know scientists try 　 　to make observations in paragraph 2.

（3）After Newton shone a spectrum of different colors through the prism，he saw 　      .

（4）The scientist did a test and found that trees can grow because of 　         　.

（5）We have learned that 　             　from the passage.

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