五、完形填空。
The is our home. It is a beautiful place. There are mountains, rivers, lakes and . There are many green trees and colourful too. Animals are our . We live together on the Earth.
But sometimes, we are not friendly to our Earth. We do bad things. We too much water and oil. We cut down too many . Animals have no homes now. We use too many . They make the Earth dirty.
We should not do these things. We must our Earth. Let's work together and keep our Earth clean and healthy!
()1. A. Earth B. Moon C. Sun
()2. A. posters B. oceans C. projects
()3. A. zoos B. schools C. flowers
()4. A. teachers B. parents C. friends
()5. A. save B. waste C. drink
()6. A. birds B. flowers C. trees
()7. A. glass bottles B. plastic bags C. paper boxes
()8. A. protect B. pollute C. leave

六、阅读短文，判断正(T)误(F)。
Air is all around us. It is around us when we walk and play. From the time we were born, air is around us on every side. When we sit down, it is around us. When we go to bed, air is also around us.
We live in air. We can live without food or water for a few days, but we cannot live for more than a few minutes without air. We take in air. When we are working or running, we need more air. When we are asleep, we need less air. We live in air, but we cannot see it. We can only feel it when it is moving. Moving air is called wind. How can you make air move? Here is one way. Hold an open book in front of your face, and close it quickly. What can you feel? It is air.
()1. Air is only around us when we play.
()2. People can live for many days without food or water.
()3. We need more air when we run.
()4. We can see air everywhere.
()5. Wind is moving air.