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I'm Mingming. I've got a new friend. His name is Jack. He is a handsome boy. He likes to play ball games. And he has lots of hobbies. But his favourite hobby is collecting stamps. He has many kinds of stamps. Some are from England; some are from America; some are from Canada. And he sends some to me. I send some Chinese stamps to him. We have the same hobby.
1．Mingming has got a new friend, Jack.2．Jack's favourite bobby is playing ball games.
3．They send stamps to each other (互相).
4．Jack's stamps are from two countries.
5．They have the same hobby.
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
