题干
——Mum, can I have another glass of orange juice?
——_______.
A：Be yourself
B：Help yourself
C：You got it
D：You are welcome
答案(点此获取答案解析）
B
——Mum, can I have another glass of orange juice?
——_______.
A：Be yourself
B：Help yourself
C：You got it
D：You are welcome
所成的比为-
，则点B分有向线段
所成的比是
