听录音，选择正确的答语。每小题听两遍。( ) 1. A. It is a sign.

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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. It is a sign.       B. Dina is sad.                    C. It means “Do not park here”.
( ) 2. A. Yes, I am.              B. No, you can’t.              C. She is unhappy.
( ) 3. A. I’d like some stickers.       B. I like collecting stamps.        C. My grandpa likes collecting old things.
( ) 4. A. I go to bed at 10:00 p.m.       B. He gets up at 6 o’clock.              C. I get up 6:50.
( ) 5. A. I water plants.             B. My father sweeps the floor.       C. My mother cooks a meal.

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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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