He ________ his head, wondering how to solve the problem. A: A scrapped B: B screwed C: C scraped D: D scratched

At the beginning of the year, Tom's Tubes had a capital stock of 5 tube inflating machines. During the year, Tom scrapped 2 old machines and purchased 3 new machines. Tom's capital stock at the end of year equals (在年初，汤姆的管子拥有5台管式充气机的资本。年内，汤姆报废了两台旧机，购买了3台新机。汤姆在年底的股本等于——中文由在线翻译而来，仅供参考) A: 1 machine.1机。 B: 2 machines.2台机器。 C: 3 machines.3台机器。 D: 6 machines.6台机器。