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| A. Shall we put it at the school gate? B. When’s Earth Day? C. I’m making a poster. D. Because Earth Day is coming. E. Is it popular in China? |
A: Hello, Jack. Are you free now?
B: No.
A: What are you doing?
B: 1．
A: Why are you doing that?
B: 2．People should know how to protect the Earth.
A: 3．
B: It’s on 22nd April.
A: 4．
B: Of course. And it’s very important.
A: O, the poster is ready. Where can we put it?
B: 5．
A: Good idea.
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
