Hi Luschen, please evaluate and grade my essay. Thank you.

[color=blue]reading part
Ethanol fuel, made from plants such as corn and sugar cane, has been advocated by some people as an alternative to gasoline in the United States. However, many critics argue that ethanol is not a good replacement for gasoline for several reasons.

First, the increased use of ethanol fuel would not help to solve one of the biggest environmental problems caused by gasoline use: global warming. Like gasoline, ethanol releases carbon dioxide into the atmosphere when it is burned for fuel, and carbon dioxide is a greenhouse gas: it helps trap heat in the atmosphere. Thus, ethanol offers no environmental advantage over gasoline.

Second, the production of significant amounts of ethanol would dramatically reduce the amount of plants available for uses other than fuel. For example, much of the corn now grown in the United States is used to feed farm animals such as cows and chickens. It is estimated that if ethanol were used to satisfy just 10 percent of the fuel needs in the United States, more than 60 percent of the corn currently grown in the United States would have to be used to produce ethanol. If most of the corn were used to produce ethanol, a substantial source of food for animals would disappear.

Third, ethanol fuel will never be able to compete with gasoline on price. Although the prices of ethanol and gasoline for the consumer are currently about the same, this is only because of the help in the form of tax subsidies given to ethanol producers by the United States government. These tax subsidies have cost the United States government over $11 billion in the past 30 years. If the United States government were to stop helping the producers in this way, the price of ethanol would increase greatly.

[color=blue]Listening part
Ethanol actually is a good alternative to gasoline although you just read three reasons why it is not a good alternative. Not one of these three reasons is convincing.

First, the increased use of ethanol will not add to global warming. It is true that when ethanol is burned, it releases carbon dioxide into the atmosphere. But as you read, ethanol was often made from plants such as corn. Well, the process of growing the plants counteracts this release of carbon dioxide. Let me explain. Every growing plant absorbs carbon dioxide from the air as a part of its nutrition. So, growing plants for ethanol production actually removes carbon dioxide from the atmosphere.

Second, large scale production of ethanol does not have to reduce the source of food for animals. That is because we can produce ethanol using cellulose. Cellulose is the main component of plants’ cell walls, and you find most cellulose in those parts of plants that are not eaten by animals. So, since we can produce ethanol from the plant parts that are not eaten, the amount of animals feed that is available will not be reduced.

Third, in the future, ethanol will be able to compete with gasoline in term of price. It is true that the government subsidies make up ethanol is cheaper than it would normally be, but this support would not always be needed. Once enough people start buying ethanol, ethanol producers will increase their production of ethanol. Generally, increased production of a product leads to a drop in its price, so the price of ethanol will go down as more of it becomes available. Study shows that if ethanol production could be three times greater than it is now, the cost of producing a unit of ethanol would drop by forty percent.

[color=blue]My essay
The reading criticizes ethanol as a replacement for gasoline. However, the lecturer says that ethanol fuel is good alternative for gasoline by giving three reasons that ethanol fuel is environmental friendly, effect-less for animal food supply and low price.

The lecturer opposes the point that ethanol fuel is helpless for environment over gasoline. He says using ethanol fuel won’t add the carbon dioxide into the air because ethanol fuel is made of corn which absorbs carbon dioxide when growing. That is, the quantity of carbon dioxide made by burning ethanol fuel is equal to it absorbed by the corn. So using ethanol fuel won’t add the carbon dioxide in the air.

Moreover, using ethanol fuel also won’t consume the food that should use to feed animals. The lecturer argues that the materials of making ethanol fuel are the parts that should have been discarded rather than the part that should be eaten by cows or chickens. As a result, production of ethanol won’t reduce the amount of plants available for other animal.

In addition, the issue of higher price of ethanol fuel also is contradicted by the professor. He claims that the price of ethanol fuel is high because less people choose to use ethanol fuel, and if the number of people who use ethanol fuel increases, this situation would be changed. If the people who use ethanol fuel are 3 times than it is now, he maintains, the price of ethanol fuel would drop 40 percent.

TOEFL listening lectures: Which country was not an important cotton grower in the 19th century?