单项选择题
A．Fly ash. B．The construction of dams, bricks, and roads. C．Extracting aluminum, silicon, and magnetic from ash. D．The available technology.
A．Instead B．Instead of C．Further D．Again
A. I think so. B. Don’t mention it. C. Please take it easy. D. What’s the matter E. And you F. I’d love to. G. But he panned to. H. Me, too.