选择合适的翻译( )
在春天你们做什么?
A:What do you do in summer?
B:What do you do in winter?
C:What do you do in spring?
当太阳直射在北回归线时,我国处于( )季节。
已知集合A={0,1,2,3,4},B=x|x=n,n∈A,则A∩B的真子集个数为( )