完成作文，说明大家保护环境的重要性并说明你的理由。We live on the Earth. The

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完成作文，说明大家保护环境的重要性并说明你的理由。

We live on the Earth. The Earth was 1.________ , but now some parts are dirty. Let's work together to keep the Earth pretty and healthy because the Earth is only home for all the living things. We should 2.________. We should 3.________. We also need water and trees. So we shouldn't 4. ________. We should stop 5.________.

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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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