听对话，根据所听对话及问题，选出最佳选项，听两遍。_____ 1. A. Ride a bike.

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听对话，根据所听对话及问题，选出最佳选项，听两遍。
_____ 1. A. Ride a bike. B. Fly a kite. C. Read and write.
_____ 2. A. He made a poster. B. He cleaned the classroom. C. He planted trees.
_____ 3. A. Helen's grandma. B. Mike. C. Helen's parents.
_____ 4. A. It means "Be quiet". B. It means "Danger". C. It means "No smoking".
_____ 5. A. He was in the park. B. He flew kites with his sister. C. It was cold and windy.

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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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