A:极昼现象
B:日月星辰的东升西落
C:四季变化
D:温带地区,冬夏昼夜长短不同
There are many ____ (different) between living in a big city and living in the countryside.
下面四个图形中,∠1=∠2一定成立的是( )
下列关于染色体组的叙述错误的是( )
hóng
tài
mò
yuè
wān
dǒng
____伟
____山
沙____
五____
海____
____得