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| Sometimes, he goes to work on foot. Because he thinks there are too many cars on the road. Shall we run together? How does he usually go to work? Yes, he is. Today is World Water Day. |
Tim: Is the man in that photo your father, Betty?
Betty:
Tim: He looks very strong and healthy.
Betty: He usually rides a bike.
Tim: Why not drive to work?
Betty:
Tim: Oh, I see! That's really a good way to make the air clean.
Betty: And I'll learn from him. I'll run to school from next week!
Tim: Sounds interesting.
Betty: Yes, of course.
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
