Question

they,bum,much,clean,for,breathe,harm,

waste,pollute,when,produce,it


  Air pollution affects the air we breathe. It is full of 1 gases,drops and particles (颗粒).These make the air quality (空气质量) poor. Many things can cause air 2 . Some air pollution is from 3 things. People use oil to make gasoline (汽油) 4 cars. Cars and trucks produce a lot of air pollution. Coal can give off harmful gases 5 people burn it to make power. Biomass fuels(生物燃料).like wood,can cause a little air pollution. It does not produce as 6 as natural fuels. Some do not 7 any air pollution,such as,solar energy,wind energy and water power.

  Air pollution can make 8 hard for some people to breathe. People with heart or lung diseases can have trouble  9 when  there is a lot of pollution. Scientists are looking for 10 fuels. They are trying to make the pollution in the air lower.

1.         2.          3.        

4.       5.          6.        

7.         8.          9.      

10.      

Answer 1

1. harmful 2. pollution 3. burning 4. for 5. when 

6. much 7. produce 8. it 9. breathing 10. cleaner