Professor Walker says this reduces home operating expenses. It also reduces the effect on the environment. He says the current interest in straw bale houses is a direct response to the problem of climate change.

　　David Lanfear owns an eco-friendly home building service in the United States called Bale on Bale Construction.

　　He says he laughed when some friends first told him about houses built of straw. But after doing his own research, he learned that building with straw bales made a lot of sense. He has now helped to build more than ten straw bale houses and says the building material is becoming more widely accepted.

　　To build the houses, he fills a wood frame with tightly packed bales of straw. Next he coats the walls inside and out with layers of clay plaster. He says the common ideas about straw houses continue, including stories about the threat of fire. Mr. Lanfear says straw bale houses have done well when tested for fire resistance. And he says his builders use the same building methods as traditional builders to keep out rain.

　　David Lanfear: “We use what we call good shoes and a good hat, and that would be a solid foundation and a really good roof.”

　　46. The function of the story in the first paragraph is to _____________.

　　A. amuse the readers

　　B. introduce the topic of this passage

　　C. help the readers to recall their childhood memory

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