advantages and disadvantages using fossil fuels,hydroelectricity,and solar energy as energy sources

  说出作为能源利用化石燃料、水力发电和太阳能的优缺点。

或者：对作为能源利用化石燃料、水力发电和太阳能的优缺点基于评判 。

（注：identify 的本意是鉴别、认定、识别）

回答

1。

   Fossil fuels include coal, oil shale, petroleum and natural gas。 The cost to mine them is lower than that of hydroelectricity, but thier resources are limited。

   Besides, fossil fuels are prone to cause environmental pollution。

化石燃料包括煤炭、油页岩、石油和天然气。它们的摘 掘成本比水电低，但是资源有限，而且易于造成环境污染。

2。 There is uncountable water in rivers and seas, therefor, the sources of hydroelectricity is rich。

   It is advantageous to prevent environment from polution to use hydroelectricity as an energy source。 However, the construction cost is higher than any other energy source。

河流和大海中有取之不竭的水，因此水电资源是丰盛 的。利用水电作为能源易于避免环境受到污染，不过它的建设成本比其他能源都要高。

3。 Solar energy is the cheapest one among all energy sources。

   It is from the sun, so it's resource is unfailing。 The most important is that using solar energy is more advantageous to keep polution from enviroment 。

太阳能在所有能源中是便宜的。它来自太阳，因此它的资源是无穷无尽的。最重要的是利用太阳能更利于保护环境。