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Amy: Hello, Sam. What are you doing?
Sam:
Amy: Oh, tell me more about Beijing.
Sam: It’s got about twenty million people.
Amy: Wow! That’s very big.
Sam: Yes, it is. And there’s a famous Great Wall in Beijing.
Amy: Really?
Sam: It’s more than twenty thousand kilometres long.
Amy: Wow! It’s really long. I want to visit it some day.
Sam: Yes, I’d love to.
| A．How big is it? |
| B．Is it very old? |
| C．I’m reading a book about Beijing. |
| D．How long is it? |
| E．Can you go with me? |
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
