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A: 1．
B: It’s a rubber.
A: 2．
B: No, it isn’t. Perhaps (也许) it’s Helen’s.
A: 3．
B: She’s in the bedroom.
A: Come here, Helen. 4．
B: Let me have a look. Yes, it is. Thank you.
A: 5．
| A．Is that your rubber? |
| B．Not at all. |
| C．Mike, what’s that over there? |
| D．Is this your rubber? |
| E．Can I have a look? |
| F．Where’s Helen? |
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
