【简答题】Mary told me not to worry because the (operate) ______on Mr.Smith was very successful.
【单选题】—Tom, may I borrow your book Chicken Soup? —Sorry, I ____ it to Mary. [ ]
【简答题】A.Because books could be lent to everyone. B.Because books could be lent at no costs. C.Because books were lent to students and faculty. D.Because books were lent on a paid membership basis.
【单选题】100个初级精母细胞经过减数分裂以后可以形成——个精子
【单选题】100个初级精母细胞,经减数分裂以后,最终形成的精子数目是
【单选题】He ___ some books ___ me, and never gave them back. [ ]
【单选题】以下哪项不属于机械零件常见的失效形式( )
【简答题】100个初级精母细胞经过减数分裂后可形成( )个精子;100个初级卵母细胞经过减数分裂可形成( )卵细胞。(以动物为例)
【单选题】100个初级精母细胞经过减数分裂以后可以形成精子数目是