听录音，选择正确的答语。每小题听两遍。( ) 1. A. My birthday is on

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类型：听音，选择正确答案

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听录音，选择正确的答语。每小题听两遍。
(     ) 1. A. My birthday is on March 1st.        B. At 9:00 a.m.
(     ) 2. A. It’s playing with its mother.     B. They’re playing with each other.
(     ) 3. A. It’s Lily’s.                    B. He’s eating.
(     ) 4. A. Summer.                                B. Because it’s warm.
(     ) 5. A. I’m watching TV now.        B. I often watch TV at home.

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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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