填空。

一位游客说:“我来自世界上唯一地跨亚、欧两大洲，东、西两个半球的国家，我们那里地广人稀，矿产资源丰富……”这位游客来自（    ）

已知正四棱锥的各棱棱长都为$3\sqrt{2}$，则正四棱锥的外接球的表面积为(    )

用吡罗红甲基绿染色剂对人口腔上皮细胞进行染色，结果发现细胞核呈绿色，细胞质呈红色．下列解释中正确的是（  ）

阅读理解
    Mr. Black is American, but he is in Canada now. He is a tall man with funny glasses. He works in a big city but lives in a town far away. He lives on the twentieth floor of a building. Every morning he gets up early. Then he gets into the lift and it takes him down to the first floor. He runs to the bus stop and catches the early bus. It usually takes him about two hours to get to the factory by bus. Then he gets off the bus and walks into the workshop(车间) quickly. He starts his work at eight in the morning.