P90-3从下列词组中选出合适的单词或短语,用其正确形式完成句子。选项中有一多余选项。 water conservation carbon footprint LED bulb reusable water bottle renewable energy smog light pollution greenhouse effect carbon dioxide 1.You can walk or ride a bike to school instead of taking a taxi to reduce your [ ]. 2.The company has replaced all the regular lightbulbs with[ ] to reduce the energy it uses. 3.Taking short showers of less than eight mn utes instead of baths is a useful tip on[ ] 4.[ ]is a kind ofair pollution named for the mixture of smoke and fog in the air. 5.The good news is that[ ] can be reduced by only using light when and where it is needed. 6.Plants take in carbon dioxide and produce oxygen, which is an effect e way of balancing the[ ]and preventing global warming. 7.Students are encouraged to use[ ] at school instead of buying bottled water. 8.We have achieved a great deal in the development of[ ], such as wind power andsolar energy.