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（______）1. Where are your parents?
A．Yes, I’d like some fruit.
（______） 2. Is your brother sleeping in the room?
B．They are at home.
（______） 3. Can I help you?
C．She’s playing the piano.
（______） 4. Would you like some fruit?
D．No, I’m not.
（______） 5. Can you see the red light?
E．She’s singing.
（______） 6. What is Helen doing?
F．Yes, please.
（______） 7. Are you busy?
G．No, I can’t.
（______） 8. What is she doing in the music room? H. No, he isn’t.
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
