听录音，根据对话及问题选出最佳选项，听两遍。( ) 1. A. A bike.

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听录音，根据对话及问题选出最佳选项，听两遍。
(     ) 1. A. A bike.       B. A kite.       C. A red packet.
(     ) 2. A. She goes to school on foot.   B. She uses plastic bags.   C. She doesn’t use plastic bags.
(     ) 3. A. He watched TV.       B. He read books.       C. He planted trees.
(     ) 4. A.

( ) 5. A. She picked some apples. B. She went to a farm. C. Yes, she did.

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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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