第22题: [单项选择]自然循环锅炉的水循环回路由()设备组成。 A. 汽包、过热器、再热器 B. 汽包、下降管、水冷壁 C. 汽包、下降管、省煤器 D. 汽包、水冷壁、过热器 参考答案:B
第23题: [单项选择]What happened to the shop in one month A. The shop was on fire twice. B. The shop closed twice. C. The shop was broken into twice at night. 参考答案:C 答案解析:[听力原文]17-20 Mr. Blue is a rich businessman. He had a nice shop in the main street of a small