Little Justin was born in the river. It is spring . He is small and black . He looks around. He can not find his mum .
Justin :Mum , where are you ?
Soon he has a round head and a long tail . He meets a fish in the river . She also has a round head and a long tail .
Justin :Mum ?
Fish :No . I'm not your mum . Your mum has four legs . She's green and she has no tail.
Later, Little Justin has four legs . He is green . He meets a turtle .
Justin :Are you my mum ?
Turtle :No, I'm not your mum . Your mum has a big mouth . She can catch flies .
1.Little Justin
2.Little Justin
3.Little Justin's mum
4.Little Justin's mum
5.Little Justin's mum
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2