2．The underlined word “one”(in Paragraph 2) refers to“

　　”．

　　A．a gas supply side

　　B．a policy for gas development

　　C．a gas consuming nation

　　D．a business environment

　　3．The main purpose of the passage is to

　　.

　　A．warn people of the lack of power and fuel

　　B．discuss the importance of oil and natural gas

　　C．instruct people how to make use of energy sources

　　D．call for better use and development of natural gas

　　4．The passage might be followed by a paragraph about

　　.

　　A．which countries are in great need of gas

　　B．where energy sources are concentrated

　　C．what kind of help you can offer

　　D．what problems of energy sources we may face

　　B

　　As the railroads and the highways shaped the American West in the past centuries，a new electrical generating(发电) and transmission(输送) system for the 21st century will leave a lasting mark on the West，for better or worse.Much of the real significance of railroads and highways is not in their direct physical effect on the scenery，but in the ways that they affect the surrounding community.The same is true of big solar plants and the power lines that will be laid down to more electricity around.

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