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| A．I'm fine, thank you. |
| B．It's in her bag. |
| C．No, it isn't. |
| D．Yes, he is. |
| E．She's my mother. |
| F．It's a dog. |
| G．I'm nine. |
1. Is this your sister? （
2. Who（谁）is she? （
3. Is he a policeman? （
4. What's this? （
5. Where's my book? （
6. How old are you? （
7. How are you? （
8. How many girls? （
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
