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It’s spring again now. The weather is wet and warm. The beautiful swan goes back to the river. The three ducks are so surprised (吃惊的). They watch the swan happily. The swan has two big wings. They are white, warm and soft. It has a long neck too. The ducks sit on the swan’s back. The swan take them to the sky. They are so happy. Now they become good friends.
1．What season is it now?
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2．Where does the swan go back?
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3．How does the swan look like?
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4．Where do the ducks sit?
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5．How do they feel?
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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
