1、ComparisonDevelopment in the past1._ 2.developmentSources/Forms of energy used2._ like coal,gas and oil3._ energy such as solar energy,wind energy and hydroelectricitySustainableFuelsAlternativeAdvantages and 4._It polluted the 5._.Burning these fuels contributes to air,water and soil pollution and
2、causes acid rain.It wasted natural resources.We are 6._ fossil fuels so rapidly that they will run out in the future.We can depend on the alternative energy for heat,light,hot water and electricity,without 7._ the environment.It is a simple idea,which is hard to put into 8._.ConclusionUnder no circu
3、mstances shall we develop economy at the sacrifice of 9._ environment in other words,sustainable development is a 10._ for the future.environmentconsumingpollutingpracticedestroyinggiftdisadvantages短语含义on top在上面，在顶部on(the)top of在上面from top to toe浑身上下，全部at the top of ones voice高声地from top to bottom从上到下，彻底“课时跟踪检测课时跟踪检测”见见“课时跟踪检测课时跟踪检测(三三)”(单击进入电子文档)
