【单选题】细胞核重复有丝分裂,最后细胞质再分裂,经过分裂,一个个体同时产生多个个体,原生动物的这种生殖方式为()。
【单选题】—How is he getting on with his spoken English? —Great. Now he can speak English ______ his English teacher. [ ]
【简答题】He speaks English so fluently as if he __________ English in England. [A] studied [B] had studied [C] would study [D] should study
【单选题】—How is he getting on with his spoken English? —Great. Now he can speak English _____ his English teacher. [ ]
【单选题】下面两种凸轮机构,属于空间凸轮机构的是( )。