上个星期五，孩子们做了社会调查 。 Last Friday ,the children had social studies.

他们了解到非常有趣的话题。  they learned about a very interesting topic.

恐龙生活在几百万年前 。  Dinosaur lived millions of years ago.

生活在几百万年前 。  lived millions of years ago.

跑得快  ran fast.

 行走得慢 。  walked slowly

吃草  ate grass

 吃植物 。  ate plants,

 吃肉 。  ate meat

去图书馆找信息。 go to the library for information.

制作海报。make a poster ,

北京人的化石 。  the bones of Peking man

一个猿人 。  a ape man

他为了食物用石头杀死动物 。  He used stones to kill animal for food.

他从附近的河中取水 。 He got water from the river nearby.

他生火是为了煮食物和在冬天取暖 。  He made fire to cook and to keep warm in winter.

他在墙上画画 。  He drew pictures on the wall.

他吃植物和肉  He ate plants and meal.

他用动物的皮毛制成衣服 。 He made clothes from animal furs.

他们用铲子在地上挖坑，然后他们带来小树苗把他们放进洞里 。  They used spades to dig holes in the ground，Then they brought young trees and put them into the holes.

 他们给小树苗灌水 。 They watered the young trees.

 树木对于人们来说是非常重要的 。  Trees are very important to people.

 他们能阻止大风，他们能制造新鲜干净的空气 。 They can stop the wind，They can make air fresh and clean.

学生想要他们的国家更绿 。  The students want to make their country greener.

元旦 。  New Year's Day.

母亲节 。  Mother's Day.

春节 。  the Spring Festival.

　去植树 。  go to plant trees

挖洞 。  dig holes

放树苗到洞里 。  put the trees into the holes.

给树浇水 。 water the trees.

你种了多少棵树？ How many trees did you plant ?

今天是植树节，动物们想要他们的家园更加美丽 。 It was Tree Planting Day，The animals wanted to make their homeland more beautiful.