A:have breakfast
B:get fat
C:get up
D:start work
若扇形的半径为9,圆心角为120°,则它的弧长为____ .
A:Hello!____
B:Hello.Ma Jia.
A:____ ?
B:My name is Gao Shan.
B:I'm from Qingdao.
B:I'm 13 years old.
A:____ .
B:Nice to meet you too.
下列说法中,正确的是()