搜索
Liu: Were you at this school thirty years ago?
Wu: Yes. I was. 1．
Liu: Was there a library?
Wu. 2． But there weren’t so many books in it.
Liu: Were there any trees?
Wu: 3． Look, they are still here.
Liu: 4．
Wu: No. there wasn’t.
Liu: How many students were there at that time?
Wu: 5．
| A．About six hundred students. |
| B．Yes there were. |
| C．But the school was small at that time. |
| D．Yes. there was. |
| E．Was there a computer room thirty years ago? |
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
