D. Children’s dreams are always changing.

　　参考答案46—50、BCDAB

　　This is an old tale. It’s the story of the three little pigs and the big bad wolf that blew down a house made of straw and one made of sticks. The only house left standing was the one made of bricks. Now there is new evidence to suggest that houses built with bales of straw can be very strong. They are also environmental.

　　Pete Walker is a professor at the University of Bath in Britain. He and a team of researchers there have built a house made out of straw bales and hemp material.

　　During the next twelve months the team will study the effectiveness of these materials in home building. Professor Walker says there are many good reasons for using straw.

　　Professor Walker says that one of the benefits is that it’s a relatively inexpensively renewable material that’s readily available.

　　According to Professor Walker, straw takes in carbon dioxide as it grows. So it can be seen as having no harmful effects on the environment. He says straw helps the environment in other ways.

　　Professor Walker: “The straw bale walls are relatively thick and so all that straw provides very good thermal(of heat)

　　insulation. So we make buildings that require very little heating in the winter or indeed very little cooling in the summer. So they require very little additional energy.”

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