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Mary: The windows are dirty.
Ben: Sure. Where is the towel? Oh, it’s over there. Would you please pass us the towel, Tom?
Tom:
Ben &Mary: Thank you.
Ben: Now the windows look clean and bright.
Mary: Yes. They are very bright. Let’s take a break.
Ben: I’m sorry.
Mary: Let’s do it now. Then we can play together.
Ben:
| A．I have to do my homework first. |
| B．Sure. Here you are. |
| C．Good idea. |
| D．Shall we clean them? |
| E．Would you like to play chess 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
