第7题: [单项选择]下列哪组重要建材在18~19世纪相继问世并广泛运用,成为主要结构材料 A. 石材、钢铁、机砖、复合板 B. 钢材、水泥、混凝土、钢筋混凝土 C. 砌块、高强塑料、铝合金、不锈钢 D. 充气材料、合成砖块、预制构件 参考答案:B 答案解析:[解析] 18~19世纪问世的建材是钢材、水泥、混凝土等。
第27题: [单项选择]A. To find out what his interest is. B. To encourage him to try out for a college newsletter. C. To help him choose an out-of-class activities. D. To talk about the articles he wrote in his journalism class. 参考答案:B 答案解析:[解析] 19-21 M: Hi, Mrs. Dupree. You asked me to come by W: Oh, yes, Clinton. Thanks for coming