听录音，根据句子选择正确的答语。(听两遍)( ) 1. A. He saw a lot of

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听录音，根据句子选择正确的答语。(听两遍)
(     ) 1. A. He saw a lot of animals.       B. He did a lot of work.       C. He made a video.
(     ) 2. A. He was born in 1980.       B. He's Confucius.       C. She's Helen Keller.
(     ) 3. A. At eight o'clock.       B. Three hours.       C. In the afternoon.
(     ) 4. A. In 1880.       B. She lived to be eighty-seven.       C. He was ninety.
(     ) 5. A. She bought him a model of a spaceship.       B. She met him at the airport.     C. She met her at the airport.

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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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