Sarah's home is a little far from her school. So she always _______ to school.
A:take a bus
B:by a bus
C:takes a bus
D:by bus
历史的发展具有一定的内在联系。下列史实的搭配,不具有直接因果联系的是( )
下面关于水电解实验的叙述正确的是( )