2.Trees make our life better in many ways.As trees need CO
2 when they (1)
/gr??/,they take in CO
2 so that there will be less of it in the air.Also,trees can give off O
2,which is (2)
/nes?s?r?/for all living things on the earth.
Trees and forests play an important part in(3)
(help) to improve our environment.They can stop the soil (4)
being washed away.They can make water better and the air (5)
(clean).At the same time,forests are the home of many (6)
,such as tigers,elephants,monkeys and so on.
However,forests all over the world are becoming fewer and fewer.People cut down trees to make paper,build houses or do other things.Every minute,between 50 and 100 acres(英畝) of forests are (7)
(destroy).If this goes on,there will be no forests left in one hundred years.
Luckily,many countries have come to realize the (8)
(important) of forests.They pass laws to (9)
/pr?'tekt/ the forests.For example,in some countries, (10)
people cut down one tree,they will plant another tree or more trees.