Geothermal heating technology is__________________.

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

The green building movement is changing the way buildings are constructed. This movement started in the 1970s, as people began to see that modern life was destroying the environment we all share. Natural resources were being destroyed, energy and water consumption was rising, and so was pollution of all kinds. This environmental destruction has continued, and one important factor has been the way that buildings are constructed. In fact. energy use in buildings represents about 32 percent of all energy use in the United States. In the early years, green builders were a small minority, and their goals of reducing the environmental impact of buildings were considered unrealistic. Now, however, the green building movement is growing, as builders have been able to take advantage of new technology and as the costs of this technology have gone down. Environmental building methods are now practical enough to save money for builders and for building owners, even as they reduce damage to the environment.

First, green builders try to make use of recycled materials as much as possible. In fact, vast amounts of materials such as steel, cement, and wood are used in construction. Now there are companies that specialize in gathering old materials, processing them, and selling them to builders for new buildings. States and cities are encouraging these companies, as the reuse of materials also means less waste in dumps. For larger builders or individual homeowners, it is possible to find everything from steel and cement to doors, windows, sinks, tubs, brick, and hardware.

Another way that builders can reduce environmental impact is to reduce the energy requirements of a building. This can be done in several ways. One is to provide an alternative, nonpolluting source of energy. The first alternative energy source to be developed was solar power. With solar panels-wide. flat sheets of special material-it is possible to produce electricity from the rays of the sun. Builders can install solar panels on the roofs of buildings and connect them to cooling or lighting systems. Once the panels are installed, they provide energy at no cost and with no pollution. Another, nonpolluting solution for reducing energy use is a technology known as geothermal heating. To obtain geothermal heat, buildets place special pipes below ground, where temperatures remain constant all year. In the winter, the earth's natural heat can be collected in these pipes, and then transferred into the building's heating system. In the summer, heat in the buildinçffe collected and sent to the pipes underground.

Câu 15494: Geothermal heating technology is__________________.

A. using underground pipes to collect geothermal heat

B. collecting pipes from below ground

C. using underground pipes to control underground temperature

D. using up the heating energy

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