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Lily: Good morning! Is that Nancy?
Nancy: Yes, this is Nancy speaking.
Lily: Nancy, are you free now?
Nancy:I’m sorry. I’m doing some housework at home.
Lily: What’s David doing? Is he cleaning the windows?
Nancy:No,he isn’t. He is reading stories in the study.
Lily: Are you free this afternoon?
Nancy: Yes, I am.
Lily: Shall we go to the library this afternoon?
Nancy: Great!See you this afternoon.
Lily: See you.
1．Nancy is doing her homework. （______）
2．David is reading some books. （______）
3．Lily is cleaning the window. （______）
4．Lily and Nancy want to go to the library. （______）
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
