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| How much were they? I often go on the Internet. I always read e-books on it. I called for some food and drinks. Would you like something to drink? But I think the computer is the most useful. A bowl of beef noodles and a bottle of orange juice. |
A: What did you do on the mobile phone just now?
B:
A: What did you call for?
B:
A:
B: Fifteen yuan.
A: The mobile phone is useful, right?
B: Yes, it is.
A: Yes. What do you do on the computer?
B:
A: I see.
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
