尿素、多余的水和无机盐，除了通过____形成尿液排出外，也能通过皮肤中的汗腺分泌汗液排出，人在运动时汗液显著增多的意义是____．

在用稀硫酸与锌制取氢气的实验中，加入少量硫酸铜溶液可加快氢气的生成速率．请回答下列问题：

    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.

与下图相对应的我国古代地方行政管理制度分别是

对于“云贵高原—青藏高原—河套平原—天山山麓”四大地形区农业特色的排列正确的一组是（   ）