A:Not bad.
B:Thank you.
C:That's all right.
—Well,you know,English is my ________.So it is my best choice.
人体的呼吸系统组成包括( )
傣族人民有泼水节,彝族人民有火把节,你还了解那个少数民族,把你知道的写一写。
如图,在正五边形ABCDE中,连接AC、AD、CE,CE交AD于点F,连接BF,已知AB=1,则DF的长是( )