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Lingling is a Chinese girl. She likes collecting stamps. Lingling has got some friends from Canada, the UK and the US. They often send her letters. So Lingling has collected many stamps from Canada, the UK and the US. She has got a stamp book. She puts her stamps into this book. Some stamps are very new and some are very old. She likes the stamps in her stamp book. She can tell many stories about the stamps. Do you want to be her friend?
1．Lingling likes collecting books.2．Lingling’s stamps are from Canada, the UK and the US.
3．Lingling’s friends often send her stamps.
4．All her stamps are very new.
5．Lingling can tell many stories about the stamps.
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
