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John: This is John speaking.
Mike: 2．
John: I'm doing my homework.
Mike: What is your grandpa doing?
John: 3．
Mike: Is your father watching TV?
John: 4．
Mike: What's he doing?
John: He's reading a book.
Mike: 5．
John: Sure. See you soon.
Mike: OK. See you.
| A．He's watching TV. |
| B．No, he isn't. |
| C．What are you doing, John? |
| D．Would you like to play ping-pong with me? |
| E．May I speak to John? |
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
