细胞生物学的分支包括细胞遗传学、（）、（）。
参考答案：细胞生理学；细胞化学
There is no doubt the boxes were then put on a train for Konigsberg, was at that time a German city on the Baltic Sea.
A．whether, which
B．that, where
C．that, that
D．that, which
Of all the subjects, chemistry seems to be _______ for me. [ ]
A. difficult
B. too difficult
C. more difficult
D. the most difficult
