Unit 10 Air 知识点题库

Are you ______?

A . crying B . cry C . crys

写出下列句子的意思。

一What makes the air dirty?

一The smoke factories makes the air dirty．

A . of B . in C . from

去公园

植树

让我们去公园。

这里的空气是如此的新鲜。

Are you crying？（否定回答）

我们看不到它。

它对所有人都是重要的。

我们需要它保证我们活着。

We can feel it.（变为否定句）

The air the high in the sky.

Look at the plane and the birds. The air keeps ________ high in the sky.

A . them B . they C . their

The black smoke ________ from the cars.

A . come B . coming C . comes

I'm not (cry). My eyes (hurt).

makes the dirty air what ( ? )（连词成句）

keep air trees the clean ( . ) （连词成句）

—Are there any f near your home?

—Yes. The smoke makes the air d.

读一读，根据图片提示写出正确的答案。

A. 图片_x0020_3 a parachute (降落伞)

B. a sailing boat

C. a hot-air ballon

D. a kite

（1） It is round and colourful. It goes up slowly to the sky when there is heat. What is it? It is .
（2） It comes down slowly from the sky. A large piece (张，块，个) of cloth (布) keeps the air in. Air keeps it from falling quickly. What is it? It is .
（3） It goes up in the air when there is wind. It comes down when there is no wind. Children like to play with it. What is it? It is .
（4） It moves on water. Air pushes (推动) it to go. It goes quickly when the wind is strong. It cannot go when there is no wind. What is it? It is .