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Dog: Hello, Kitty. Do you have any friends?
Kitty: Yes. Look, they are all my friends.
Sheep: Hi! I'm Sheep.
Monkey: Hello, I'm Monkey.
Goat: I'm Goat.
Dog: Nice to see you all. How do you do?
All: How do you do?
Dog: Let's be friends.
All: Good. Let's be friends.(1)Kitty has no friends.(2)Sheep and Goat are friends.(3)Dog and Monkey are friends.(4)Cat and Mouse are good friends.(5)They are all Kitty’s friends.
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
