陕西省2017高考英语一轮复习《Which English》课时作业外研版选修8_高考复习指南

陕西省2017高考英语一轮复习《Which English》课时作业外研版选修8

　　favorite reason to promote its use，is that there are no greenhouse gases or other pollutants give out as there are with the burning of fossil fuels.Renewable energy，or solar，water and wind power，are certainly not new although they have received much attention recently because they will not cause pollution.Environmental friendly power sources such as wind，solar and water power have been used in both developing and developed countries for a long time because they are cheap and clean，but they have yet to be used as a primary source of energy for any big urban area.

　　28.

　　The generation of power from renewable energy sources has become somewhat more common in recent times as people have increasingly become aware of issues such as climate change due to fossil fuel by－products and the political or social worries about nuclear power.There are numerous countries and non－profit，environmentally conscious organizations that are

　　supporting the use of renewable energy.

　　29.

　　The flow of renewable energy has to do with naturally occurring phenomena.Tides，sunlight，wind and heat are all created by geothermal events and all are sources of energy has unique characteristics related to where and how we can use them.

　　30.

　　Most technology which transforms renewable energy into power which we can use is solar power either directly or indirectly.The atmospheric system of the earth keeps balance so that the heat which spreads out into space is equal to the amount of radiation received from the sun.The quantity of energy contained in the atmosphere approximates the earth’ s climate.The bodies of water of the earth，or its hydrosphere，absorb much of the radiation which is received from the sun.And much of that absorbed radiation is in the lower latitudes surrounding the equator.