delta 6个 模考 test2的综合写作 In the lecture, the professor argues that hydropower has some severe disadvantages in spite of certain advantages described in the passages.
The first point that the professor casts doubt on the passage is hydropower may be inconvenient for certain groups of people. He illustrates that building a dam forces people living behind the dam to move. This method which is bitter and controversial certainly causes inconvenience to these people. This directly contradicts the point in the passage that hydropower reservoirs contribute to the local economy and quality of life
Secondly, although the passage states that hydroelectricity is clean and green, the professor disagrees with this point and claims hydroelectricity is hazardous to environment. He explains in details that toxic wastes become a major pollution problem and are hard to deal with. Furthermore, the ecosystem in the river is disturbed by the dam. Thus the professor states that seemingly inexpensive hydroelectricity, mentioned in the passage, has heavy long-term environmental costs Finally, while the passage indicates that hydropower is renewable, the lecturer states it is unreliable source of fuel due to its dependence on the natural condition. On the whole, the professor utilizes specific and convincing evidences to support the statement that hydropower has serious disadvantages, not as perfect as the passage describes. |