单项选择题：统一的信息分类和编码体系的意义在于使计算机系统和所有的项目参与方之间具有 ( )。

题型：单项选择题

请认真阅读下列短文，并根据所读内容在文章后表格中的空格里填入一个最恰当的单词。

注意：每个空格只填1个单词。

Going soy is the way to go green

In 1829, U.S. farmers grew soybeans (大豆) for the first time. In the late 1800s, lots of farmers began

to grow soybeans as food for cattle. In 1904, at the Tuskegee Institute in Alabama, George Washington

Carver began studying the soybean. His discoveries changed the way people thought about the soybean. No

longer was it just a crop for cattle； it provided valuable protein and oil. Now soybean oil is the most popular

source for an alternative fuel.

Fueling diesel (柴油) engines with vegetable oil started with the inventor Rudolf Diesel. When Diesel

showed his engine at the 1900 World Exhibition in Paris, it was running only on peanut oil, a kind of biodiesel.

According to the United Soybean Board, biodiesel is a fuel made from vegetable oils or animal fats.

However, over the next 100 years, diesel fuel was made largely from petroleum (石油). Interest was

renewed in biodiesel in the mid-1970s when the energy shortage occurred, and gas prices surged upward

throughout the United States. In spite of these conditions, commercial production did not take place until much

later. In 1999, The National Biodiesel Board reported that 500 000 gallons per day were produced. In 2000,

production increased t0 6. 7 million gallons per day.

With the continual rising costs of petroleum products in the new century, major corp orations and the

United States government have looked to new markets. Farmers are encouraged to grow soybeans in their

fields, as the demand for soybean fuel increases. They can now get several gallons of fuel per acre of soybean.

Biodiesel is created by removing a thick liquid called glycerin from soybean oil. It is registered with the

US Environmental Protection Agency as a pure fuel, which is known as B100, or as a fuel additive, which is

called B20, a mixture of 20 percent soy and 80 percent petroleum-based diesel.

There are many benefits of soybean fuel.

Studies have shown that biodiesel from vegetable oil reduces petroleum consumption when used in place

of petroleum diesel.

In addition, the use of biodiesel reduces CO2 in the earth's atmosphere. This is due to the fact that growing

soybeans consumes nearly four times as much CO2 as the amount of CO2 produced from biodiesel waste

gases.

If you ever want to take a ride in a car or bus powered by soybeans, you can. The Agriculture Research

Center (ARS) National Visitor Center bus, which is used for Beltsville, Maryland farm tours, is running on

biodiesel fuel.

ARS scientists are conducting biodiesel fuel research, and they are trying to find ways to make fuel from

vegetable oils, animal fats, and used restaurant oils.

Biodiesel fuel costs more than regular diesel fuel. However, the price may drop if people use it more. We

can look to the future with the hope that clean fuel sources will continue to be widespread in the United States

and even around the world.

查看答案

统一的信息分类和编码体系的意义在于使计算机系统和所有的项目参与方之间具有 ( )。