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Yesterday was Sunday. Wang Hai was free （空闲的）. He got up at half past six. At 9, he visited his grandparents. Then, he played basketball with his friends at 2 in the afternoon. At half past three, he watched a football match. At half past six, he had supper （晚饭） with his parents at a restaurant （参观）. What a good day!
When （什么时候） | What |
1. | Got up |
At 9 | 2. |
At 2 | 3. |
4. | Watched a football match |
At half past six | 5. |
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
