What am I?
A couch potato 沙發上的馬鈴薯 watch TV all day and do nothing else at all.
What’s she cutting?
She’s cutting the sweet potato into pieces.
What are the lands called?
They are continents.
How many people are there in the world?
There are 7.7 billion people in the world.
What percent of water is there on the surface of earth?
About 71% of the earth is covered with water, but only 3% of the water is fresh, and the other 97% is salted.
