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Su Yang:
Grandpa: Super! There was no gym in my school thirty years ago.
Su Yang: There was no gym in our school two years ago.
Grandpa:
Su Yang: Yes, we have four computer rooms now. And five years ago, we had our dining hall.
Grandpa:
Su Yang: Yes. There are many books in it.
| A．Our school changed a lot. |
| B．Is there a library in your school? |
| C．It's our gym. |
| D．We had it last year. |
| E．Do you have a computer room? |
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
