题目

Robots often star in popular science fiction movies as the bad guys that take over the world and control mankind. But with the outbreak of the coronavirus pandemic (新型冠状病毒), robots are increasingly being employed as helpers, performing often dull, difficult and dangerous tasks and thus reducing humans’ exposure (暴露) to COVID-19.Across the world, robotics companies are teaming with health care providers and government officials to develop technological solutions for dealing with the global health crisis. In China, robots have rolled down streets spraying disinfectant. In at le下图为处于不同分裂时期的某生物的细胞示意图，下列叙述正确的是(　　) A．甲、乙、丙中都有同源染色体 B．卵巢中不可能同时出现这三种细胞 C．能够出现基因重组的是乙 D．丙的子细胞是精细胞