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| A. Oops, the balloons takes the boy up to the sky. His grandma and the salesman (售货员) are very surprised. | B. He gets some money from his grandma. He gives the money to the salesmen for the balloons. |
| C. The boy is excited. He runs back to his grandma with the balloons in one hand and the coins (硬币) in the other. | D. A man sells balloons (气球) in the park. A boy wants to buy some balloons and he asks his grandma for some money. |
| E. He gives the coins to his grandma. He holds (拿着) the balloons in his hand. He likes the balloons very much. | F. The balloons are very cheap and they don't cost (花费) so much，the man gives the boy some coins back. |
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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
