阅读理解It's very important for us to learn about protecting environment around us.Here is a 4 R rule for us：
Recycle.Bottles，waste paper，glasses，plastic and so on can easily be recycled.By doing so，we can save lots of time and money.For example，coke cans are sent to a factory，where they are smashed flat（压平） and melted（融化） and the melted things are made for new coke cans.
Reduce.Millions of trees are being cut down to make paper.If everyone uses a little paper carelessly（草率地） and throw it out，soon we would not have any trees left.We should use both sides of paper.Reduce boxes and cups which can be used only once.Other things are also being wasted，and people don't know what to do with the waste in big cities.So it is necessary for us to reduce the waste.
Reuse.We should always think of reusing the usable（可用的） things before throwing them out.Give our clothes we do not use or the ones which are too small to the poor.With the family，we may pass on such clothes to younger brothers or sisters.
Repair.If one of the legs of our table is broken，we can repair it instead of throwing it away.If we want to change for better ones，it is better for us to sell the old things or give them to other people who can use them after doing some repairing.
The more we do，the better environment will be.
