If we put fresh water and sea water together，we can each get 620 m
3 water.However，sea water is too salty for us to drink if the factories don't process （加工） it first.So，620 m
3 is little.Saving water in daily life is important.
There are 3，869 billion hectares （公頃） of forests on Earth.But we are losing them because we cut trees too much.If we calculate （計算） at the size of a football field，we are losing 343，000 football fields every day，or 1431 per hour，or 24 per minute!
All the corals （珊瑚） that we have now are about 100，000 km long in 109 countries.But each of us can only have such a little piece，because seas are getting polluted and corals are dying.
According to the latest report，there are 200 billion stars in the Milky Way.Each of us can have 33 of them.Unfortunately，we cannot see most of the 200 billion stars from Earth.We can only see about 6.000 stars.If we don't use telescopes （望遠鏡） or we have bad weather，we can only see about 2，000 stars.
On average（平均），we get 0.54 billion tons of rice each year round the world and each of us can have 90 kg.People from Asia produce and eat 90%of all the rice.How long will it take you to eat up this 90 kg rice？
（1）What is important in daily life？
Saving water in daily life is important./Saving water.
Saving water in daily life is important./Saving water.
（2）Why are the forests on Earth losing？
Because we cut trees too much.
Because we cut trees too much.
（3）Do we have many pieces of corals？
No，we don't.
No，we don't.
（4）How many stars can you see if the weather isn't fine？
We can only see about 2000 stars./About 2000 stars.
We can only see about 2000 stars./About 2000 stars.
（5）Who produces and eats 90% of all the rice？
People from Asia produce and eat 90% of all the rice./People from Asia.
People from Asia produce and eat 90% of all the rice./People from Asia.
