学校科学老师在生物实验室做试验时，将水稻种子分组进行发芽试验；第1组取3粒，第2组取5粒，第3组取7粒……即每组所取种子数目比该组前一组增加2粒，按此规律，那么请你推测第n组应该有种子的粒数为（       ）

如图是某种晶体加热时，温度随时间变化的图象（加热在一标准大气压下进行，每分钟供热不变）．根据图象可知：

这种晶体的名称是 ____，其熔点是　 ____　，液态名称是 ____，加热2分钟物体处于 ____状态，加热6分钟时，物体处于 ____状态，加热8分钟时，此物质的温度是　 ____　，此时进行的物态变化是 ____，这种晶体熔化经历了　 ____　分钟．

“新丝绸之路经济带”和“21世纪海上丝绸之路”能有效促进我国经济繁荣发展．我国是最早养蚕缫丝的国家，下列关于家蚕的生长发育的叙述不正确的是（    ）

Frederick William I, the King of Prussia, ____ that his greatest gift to the Russian people would have ____. This gift was the Amber room, which was given this name because several tons of amber were used to make it. The amber ____ had a beautiful yellow-brown colour like honey. The design of the room was ____ popular in those days. It was also a treasure ____, which took the country's artists about ten years to make.

近地面大气的热量主要来自（　　）