—It was in 2000 ________ we both studied in Nanjing University.
A:when it was that; when
B:when was it that; when
C:when it was that; that
D:when was it that; that
有的人想成为“发明大王”,却畏于钻研科学知识之难;____,____; ____; ____……如此心怀鸿鹄之志而身属燕雀之行,连一条小小的鱼都捉不到,何谈实现恢宏的大志呢?
冷战结束后,世界政治格局朝多极化方向发展。在新的世界格局形成过程中,具有决定性作用的因素是( )
下列关于单倍体、二倍体、多倍体的叙述不正确的是