模拟呼吸过程中，气球相当于 （   ）。

一台电视机原来卖2000元，现在只卖1480元，这台电视机是打折出售的。

一张边长9厘米的正方形纸，从一边的中点到邻边的中点连一条线段。沿这条线段剪去一个角，剩下的面积是平方厘米。

Tom will play basketball this Sunday.

选词填空

    Today is Sunday, March 20. We, sixteen boys and seventeen girls, go to school  though we have no classes. Our teacher takes us to the  . We get on a bus. It goes fast and at half past nine we get there. How beautiful the zoo is! There are a lot of trees, some hills and a big lake. The sun is  and the flowers are coming out. In the zoo there are all kinds of  , like elephants, monkeys, birds, fish and so on. The birds are singing in the trees. And the fish are swimming in the lake. We like to watch the monkeys. They are playing on the hill or having oranges, apples and bananas. There are many rules in the zoo. Everyone should  the rules. We all have a good time. At three in the afternoon we leave the zoo.

He looks _____ than last year.

（8 ﹣10.5× ）÷4 ．

把一根长2米的圆柱形木料截成3段小圆柱，表面积比原木料增加6.28平方米，这根圆柱形木料的体积是立方米。

直接写得数。

                      

                        

等底等体积的圆柱和圆锥，如果圆锥的高是9厘米，那么圆柱的高是厘米．

听句子，选出句子中含有的信息（   ）

In spring, the trees ________ green.

你能用简便方法计算吗？

具有脊椎的动物叫，没有脊椎的动物叫。

They aren't have time to exercise.

今年植树节，小明、小刚和小东参加了社区植树活动，小明植树的棵树是小刚和小东植树棵树和的 ，小刚植树的棵树是小明和小东植树棵树和的 ，已知小东植树10棵，小明和小刚各植树多少棵？

如果一个圆锥的高不变，底面半径增加 ，则体积增加（   ）

下列动物的脚，比较适合在水中游泳的是(  )。

—!

— Good evening, children!

I have got many, some of them are from China.