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I've got a new pen friend. His name is John. He is a handsome boy. He likes to play games. He has lots of hobbies. And his favourite hobby is collecting stamps. He has many kinds of stamps. Some are from the UK, some are from the US, and some are from Canada. He sends some to me, and I send some Chinese stamps to him, because we have the same hobby.
1．The writer has got a new pen friend. （______）
2．John likes to play games. （______）
3．John and I send stamps to each other. （______）
4．John's stamps are from two countries. （______）
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
