听录音，选出你所听到的句子。(听两遍) ( ) 1. A. Helen couldn't s

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听录音，选出你所听到的句子。(听两遍)
(     ) 1. A. Helen couldn't see.       B. Helen couldn't hear.       C. Helen could read.
(     ) 2. A. Chris could write.       B. Chris couldn't write.       C. Chris could speak.
(     ) 3. A. She lived to be eighty-seven.       B. She lived to be eighty-six.     C. She lived to be eighty-five.
(     ) 4. A. Where was he born?       B. When was he born?       C. When was she born?
(     ) 5. A. He lived to be seventy-two.       B. He lived to be seventy-three.     C. He lived to be seventy-four.

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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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