听录音，选答语，每个小题读两遍。( ) 1. A. Yes, I do.

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所属科目：小学英语

听录音，选答语，每个小题读两遍。
(       ) 1. A. Yes, I do.                    B. Yes, please.          C. Yes, there is.
(       )   2. A. I am watching TV.       B. Here you are.          C. The boys like playing football.
(       ) 3. A. Five.                    B. Thank you very much.   C. There are some birds in it.
(       ) 4. A. I want two kilos of meat.        B. I want three buns.
C. I want some apples and pears.
(       ) 5. A. Yes, there is some.               B. No, there aren’t any.                 C. No, that’s all.

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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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