S1023---What lives in an ocean+2D Shapes
Today is Thursday, June 25th，2020.
What lives in the ocean?
Coral reef, crab, dolphin, fish, turtle, octopus, seahorse, jellyfish, shark, whale live in the ocean.
Have a look at the eel and coral reef.
The coral reef is a good habitat for eel because the eel can find food and shelter here.
Coral reefs are beautiful. But sometimes people hurt them/ How can we protect the reefs?
We can protect the ocean by less pollution and fishing or hunting.
What is the similarity between humans and ocean creatures?
They both have bones.
They are Arctic Ocean, Atlantic Ocean, Pacific Ocean,Indian Ocean.
The ocean covers 71% of the Earth’s surface. Many animals live in the ocean. Some, like crabs, live near their food.
Others swim far to find food. Stringrays swim hundreds of miles. Killer whales also travel far in order to follow their food. The ocean is a huge place full of amazing life.
2D Shapes:
It is a circle. Circle doesn’t have edge. Circle doesn’t have vertices. Its sum of interior angles is 180 angles.
It is a triangle. Triangle has 3 edges. Triangle has 3 vertices. Its sum of interior angles is 360 angles.
It is a square. Square has 4 edges. Square has 4 vertices. Its sum of interior angles is 360 angles.
It is a rectangle. Rectangle has 4 edges. Rectangle has 4 vertices. Its sum of interior angles is 360 angles.
It is a trapezoid. Trapezoid has 4 edges. Trapezoid has 4 vertices. Its sum of interior angles is 360 angles.
It is a pentagon. Pentagon has 5 edges. Pentagon has 5 vertices. Its sum of interior angles is 540 angles.
It is a hexagon. Hexagon has 6 edges. Hexagon has 6 vertices. Its sum of interior angles is 720 angles.
Sum of interior angles=(n-2)×180°
教学目标：
1. 学习海洋里的生物
2. 如何保护海洋
3. 对比海洋ocean，森林forest，沙漠desert
4. 复习2D图形，学习不同形状的边，顶点，内角和
课后：
1. 根据语音链接文档进行复习
2. 巩固动词单复数，把练习题的10个句子在本子上重新写一遍
