题目

下列哪一项容易被龙胆紫染色       A．染色体的非着丝点区域 B．细胞板   C．构成纺锤体的星射线    D．染色体的着丝点 答案：A 解析: 略— IPhones and iPad are so popular these days.—Yes, they can ______our eyes to the outside world.A. open up B. turn upC. call up D. think up