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（ ）Well, don’t be late for class. This is very important.
（ ）Ok, so we must be on time. Can we bring music players to school?
（ ）I see.
（ ）Hi, my name’s John
（ ）Really? What are some of rules?
（ ）No , we can’t. And we always have to wear the school uniform(校服）.
（ ）Oh , and we also have to be quite in the library.
（ ）Hi, John. I’m Alice.
（ ）This is a good school, but there are some rules.
（ ）It’s my first day at school
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
