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A: What's the matter, David?
B: I lost my pen. I can't find it.
A: What colour is it?
B: It's blue.
A: Did you bring it here?
B: Yes, I'm sure.
A: Let me help you!
B: Thank you!
A: Ha, it's here! It's under your bag.
B: Yes, it is. It's my blue pen, my favourite pen. Thank you, Sally.
A: You are welcome.
1．Sally lost her pen.（
2．The pen is red.（
3．David didn't bring it here.（
4．Sally helped David.（
5．They found the pen at last.（
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
