① On the Earth there are many kinds of plants and animals. They live together with us. They are both useful and helpful in our lives. | ② Trees are useful. We get wood from trees. We use wood to make pencils, desks, chairs and paper. | ③We get fruits from trees. We eat fruits directly or use them to make other delicious food. |
④ Trees keep the air clean. They help cool the air, too. We should plant more trees. | ⑤Sheep are useful animals. We get wool from sheep. We use wool to make clothes. | ⑥We also get mutton(羊肉) and milk from sheep. They are good for our health. |
⑦ Ducks are helpful birds. We use down and feather(羽绒) to make coats, quilts and so on. | ⑧ | ⑨ There are lots of plants and animals in the world. We can get useful things from them. |