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The energy generated from natural sources such as the sun， wind， rain， and tides is called renewable energy. They are plentiful and can be generated again and again. They also have low carbon emissions so they are considered green and environment-friendly. Moreover， using renewable energy can reduce your electricity bills. Unfortunately， solar energy can be only used during the daytime but not during night or the rainy season. Geothermal energy also can bring toxic chemicals beneath the earth’s surface to the top and can create environmental changes.
rewable:wind,solar enery,hydro,nuclear,biogas...
non rewable:coal,oil,natural gas...i think people will use it more in the future
Solar energy captured by solar panels is a limitless form of energy, as the earth is bombarded with extreme amounts of solar energy every day, according to the National Renewable Energy Laboratory. It's also clean, producing no carbon dioxide, and is very low-maintenance, since solar panels have no moving parts.
Unfortunately, the National Renewable Energy Laboratory says its high installation cost makes it up to four times more expensive than the cost of electricity from a standard utility company. For optimal operation and maximum energy production, it requires year-round sunny weather and is very expensive if repair is necessary, according to the U.S. Environmental Protection Agency.
There are some tips to save power which I think are very easy to apply. Firstly, we should use energy saving light bulbs in our house. It will help us to reduce our electricity bill. Secondly, we should use public transport if we need to go long distance. We can use bicycles for short distances. I think it is good for our health and economical. And remember, before going to bed, we should turn off all lights and other unused electrical devices. It's an easy way to save our planet.
36. Which sentence is NOT TRUE about non-renewable energy sources?
A. They take millions of years to form. B. They will run out someday C. They come from fossil fuels D. they are always available
37. Which sentence is TRUE about renewable energy sources?
A. They are bad for the environment B. They are not always available C. They are called green energy D. They can be used up
38. When does the chemical reaction take place?
A. When we use energy from the wind. B. When we burn fossil fuels C. When we use green energy D. When global warming happens
39. What is NOT INCLUDED in the five types of green energy?
A. solar B. hydroelectric C. natural gas D. biomass
40. What does geothermal come from?
A. dead plants B. heat within the earth C. the wind D. moving water
