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| We can take a bus. How much is it? I bought it yesterday. Where's the post office? I want to buy this postcard for my father. |
Li Ming: Look, Danny! This postcard has a picture of the Bird's Nest.
Danny: Let’s take it.
Li Ming: It's 4 yuan.
Danny: We need a stamp for the postcard. Let’s buy a stamp.
Li Ming: I had a stamp.
Danny: Now we can send it at the post office.
Li Ming:
Danny: It's far from here.
Li Ming: How can we get there?
Danny:
Li Ming: OK! Let's go.
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
