I often go to work ________.
A:ride my bike
B:by bike
C:by a bike
D:on bike
I am good at playing basketball,and my brother is good at it.
我国北方地区在农业生产中流传着这样的话:“春耕、夏种、秋收、冬藏”,你认为形成这种农业生产模式的主要影响因素是( )