— Less than two hours. Every week is full for me.
A:How often
B:How long
C:How much
D:How many
下列关于经纬线的叙述,错误的是( )
列竖式计算。
①67×21= ②34×84= ③85×20=
④77×23= ⑤45×30= ⑥46×33=