题干
— Are these ducks very noisy?
— ___________ （ ）
A：Yes, they will.
B：No, they won't.
C：Yes, they are.
答案(点此获取答案解析）
C
— Are these ducks very noisy?
— ___________ （ ）
A：Yes, they will.
B：No, they won't.
C：Yes, they are.
,若对所有
，则b的取值范围是