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David: Great! Let’s go.
Helen: Wow, the park is beautiful! Look! Some ducks are swimming on the lake.
David: They are lovely! I like the trees near the lake.
Tina: There are so many beautiful flowers. They are red, yellow, orange and blue. Can you draw them?
David and Helen: Sure, it’s easy.
1．Tina, Helen and David are at school.
2．Some ducks are swimming on the river.
3．There are some trees near the lake.
4．David can draw the beautiful flowers, but Helen can’t.
5．The flowers are red, yellow, orange and blue.
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
