听录音，选出你所听到的句子。(听两遍) ( )1. A. The bell is ringi

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类型：听音，选择听到的内容

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听录音，选出你所听到的句子。(听两遍)
(     )1. A. The bell is ringing.       B. The phone is ringing.       C. The dog is barking.
(     ) 2. A. Tom is crying.       B. Tom knows nothing.       C. Tom is reading.
(     ) 3. A. I'm flying in the sky.       B. They're flying in the sky.       C. I'm high up above a plane.
(     ) 4. A. We're having a party.       B. We're playing chess.       C. We're having lunch.
(     ) 5. A. It starts to rain.       B. It starts to snow.       C. It starts to be sunny.

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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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