Davidson Black was a____(Canada) doctor who organized the excavation that led to the discovery of the bones in the Zhoukoudian____(cave) near Beijing. He was a specialist in the study of bones____it was his ambition to find and identify bones of early humans. His university was aware____the significance of his work. At first they gave him ample time to do his research, but____(late) they realized he was prepared to pursue it regardless of his students' needs and his____(teach) career, so they forbade him ____(travel) there any more. It was his assistant, Pei Wenzhong____made the discovery of these primitive bones and____(sharpen) tools. Davidson Black knew that his success was almost ____(entire) due to his assistant's systematic hard work.

已知焦距为2 $\sqrt{2}$ 的椭圆C： $\frac{x^2}{a^2}$ + $\frac{y^2}{b^2}$ =1（a＞b＞0）的右顶点为A，直线y= $\frac{4}{3}$ 与椭圆C交于P、Q两点（P在Q的左边），Q在x轴上的射影为B，且四边形ABPQ是平行四边形．

1945年8月《大公报》社评说：“***先生来了！中国人听了高兴，世界人听了高兴，无疑问的，大家都认为这是中国的一件大喜事。”该报道反映的事件是（      ）

明代政治人物王世懋在其著述中描绘了景德镇因烧制瓷器而火光烛天的情形，称之为“四时雷电镇”。这被个别历史学者认为是“工业超时代发展的征象”，实际上他是以此来指责“当地居民穿凿地脉，以致没有人登科中举”。下列说法中最为合理的是（    ）