下列不具有细胞结构的是(     )

如图所示，标出了四个通电螺线管的N极和S极，其中正确的是（   ）

     Joan is an American girl. She lives in China now. She is in my class. Her parents work in China, too, but her brother works in the U.S.A. He often writes letters to them. Joan likes Chinese class very much, and likes speaking Chinese with us after class. Her father teaches us English well. We all like his class. On Sundays, Joan goes to the People's Park with her father and mother. Sometimes she goes shopping with her mother. They like the Chinese food very much. It's a happy family.

阅读材料，回答下列问题。

材料一  黄土高原形成的学说有多种。目前，“风成说”得到科学界最为广泛的支持。“风成说”认为，黄土高原主要是盛行风从中亚、蒙古高原和我国西北部内陆地区的沙漠和戈壁搬运来的黄土堆积而成的，被称为“风神捏就的土地”。

材料二  黄土高原景观图。（如图）

明治维新是日本近代化的起点，它从一个处于亚洲文明边缘的小国，实现了“脱亚入欧”的历史转折。这里的“脱亚入欧”是指(　　)