选择方框里的单词，将短文补充完整。 sun mountains birds riv

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难度系数：0.40

所属科目：小学英语

选择方框里的单词，将短文补充完整。

sun mountains birds river flowers what rainbow park clouds nice

This is a nature ________ .There is a________ and some ________in the sky. There are two________ flying in the sky. Look! There is a beautiful________ between the two ________. There is a long________ on the grass. There are some________ on the grass. ________ a________ picture it is!

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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

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2019-09-19

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2019-09-19

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