单选题 Built ______ natural materials, the houses are believed to be warm, comfortable and friendly places to live.
A. from B. with C. by D. in

【正确答案】 A

【答案解析】build from意为“用……原料建造”；build with意为“用……建造”；build by意为“用……工具、方式建造”；build in意为“在某处建造”。根据空格后面的 natural materials(自然材料)可知，应该选用from。