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A. We can't walk along all of it.
B. How old is it?
C. It's over twenty thousand kilometres long.
D. I want to go there.
E. It's near my home.
Simon: Tell me about the Great Wall.
Daming: It's long and old. When you visit me in China, we'll go there.
Simon: Can we walk along all of the Great Wall, Daming?
Daming: No.
Simon: Why? How long is it?
Daming:
Simon: It's too long!
Daming: It's more than two thousand years old.
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
