听录音，选择正确的答语。（_____）1. A. It's red. B. Yes, i

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听录音，选择正确的答语。
（_____）1. A. It's red.       B. Yes, it is.       C. Yes, it's blue.
（_____）2. A. They are black.   B. They are new.   C. They are on the chair.
（_____）3. A. It's a shirt.   B. It's mine.   C. It's white.
（_____）4. A. Yes, it is.   B. Yes, he is.   C. No, it doesn't.
（_____）5. A. No, they aren't.   B. It's blue.   C. Yes, 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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