Unit 7 The Sea 开启快乐学习之旅The undersea world is very beautiful
Now more and more people want to dive in the water to find the secrets there
Scuba diving is a new sport today
It can take you into a wonderful undersea world
You will find many strange animals in the sea
Some are as large as a school bus
Many sea animals give out light in the dark and some have sharp teeth
During the day, there is enough light
Here, under the sea, everything is blue and green
When fishes swim nearby, you can catch them with your hands
If you have bottles of air on your back, you can stay in deep water for a long time
However, you can't dive too deep, and you must be very careful when you dive in deep water
The deep sea is not an easy place to live in
It's cold, and it's dark, too
The de
