题目

The number of the people who speak English ____________large, and a large number of people ____________native speakers.A. are; are          B. is; are          C. is; is            D. are; is 答案：B北宋科学家沈括在《梦溪笔谈》中记载“用胶泥刻字……火烧令坚……一板印刷，一板已自布字……更互用之，瞬息可就”此材料反映的是哪一科技成就（ ）A．蔡伦改进造纸术 B．华佗制成麻沸散C．张衡发明地动仪 D．毕升发明活字印刷术