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A: What did you do yesterday?
B:
A: Do you like dogs?
B: Yes. Dogs are very clever and useful.
A: Really? Can you tell me something about dogs?
B: OK!
A:
B: Yes, they can. We call these dogs “Police dog” (警犬) Dogs can help the firefighters, too.
A: Really?
B: Of course.
| A．Dogs can help the blind people. |
| B．Can they help the policeman? |
| C．Last week, there was a fire. |
| D．They can do lots of things. |
| E．I watched a TV show about dogs. |
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
