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It is sunny and hot. A bird is thirsty. He wants to have some water. Then he can see a bottle. But the bottle is tall and thin. He can't drink the water. He's sad. He can see some little stones. And he has a good idea. He puts(放) some little stones in the bottle. Look! He can drink the water now. He is not thirsty. He is happy.
1．A bird is . （ ）
A. thirsty B. hungry C. full
2．The bottle is . （ ）
A. small B. tall and thin C. short
3．The bird puts some little stones in the . （ ）
A. box B. bowl C. bottle
4．The bird can drink the water. He is not thirsty. He is . （ ）
A. tired B. happy C. sad
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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
