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| How about now? We often read books in the library. Your school is bigger than before. What was your school like five years ago? And we had only one small building on a hill. Was there a library in your school before? How many classrooms were there in your school? |
A: Welcome to our school!
B: Thank you!
A: Yes, it's bigger. We had only ten classrooms five years ago.
B: Oh!
A: Now there are twenty classrooms.
B:
A: No, there wasn't.
B: Could you see the moon and stars at night?
A: Of course. And I liked them.
B: It was small. But there was a computer room. And we often have computer class in it.
A: That sounds great!
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
