It wasn't easy having my friends talk about their freshman years____ I wasn't a part of.
A：whom
B：when
C：that
D：what
进行淀粉水解实验，同时检验水解产物和水解是否完全，除加淀粉和水外，还应加入相应的试剂及加入顺序最好的是（ ）
细胞的分裂从____ 开始；分裂过程中____变化最明显．
