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A fox is very hungry. He is looking for(寻找) food. Now he is standing still beside a wall. He sees a lot of fine grapes on the wall. “How nice they are! I want to eat them.” The fox jumps and jumps, but the wall is too high. He can’t get the grapes. The fox goes away and says, “I don’t like those grapes. They are not good to eat.”
1．The fox is looking for ______. ( )| A．grapes | B．fruits | C．food |
| A．runs and runs | B．jumps and jumps | C．goes away |
| A．high | B．short | C．long |
| A．the grapes are not good | B．he can’t get the grapes | C．he isn’t hungry |
| A．In front a wall. | B．Beside a wall. | C．On a wall. |
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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
