What had to transfer from sea to land before any animals could migrate? (C9-T1-R3 T27)
Assumptions underlying the search for extra-terrestrial intelligence(C9-T1-R1 T14)
Michael Faraday was the first person to recognize Perkin’s ability as a student of chemistry. (C9-T1-R1 T1)
医疗与健康
传统文化
社会
娱乐
动植物与环境
教育