阅读下列短文，从每题所给的a、b、c和d选项中，选出最佳选项，并在答题卡上将该项涂黑。
a
when building houses, people used to think about not only the climate of the areas but also the building materials and the fashions for their houses. however, since electricity became more and more expensive, people began to pay much more attention to the energy they could get for their houses and the new ways they could find to protect their houses from both cold and heat.
houses of an old yet new type have been widely built. in some parts of the world, people share their houses with their livestock (家畜). during cold weather, they gather their cows, goats, or other animals and keep them on the first floor of their houses. the reasons are that the animals can be protected from the cold and that they can help to heat the houses as well. the body heat given off by the animals rises to the second floor of the houses, where people live. by sharing their houses with their livestock, people gain a source of heat.
资源难易程度:★★★★★★★★★★★★★★★
高考资源网版权所有 ©2005-2014
未经许可，盗用或转载本站资料者，本站将追究其法律责任！
