听录音，根据句子选择正确的答语。(听两遍) ( ) 1. A. She's reading

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类型：听音，选择正确答案

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听录音，根据句子选择正确的答语。(听两遍)
(     ) 1. A. She's reading a book.       B. He's reading a book.       C. She reads a book.
(     ) 2. A. They have a picnic.       B. They're having a picnic.       C. They have a party.
(     ) 3. A. He's crying.       B. He's from England.       C. They're having a party.
(     ) 4. A. They're having a picnic.       B. I can speak English.       C. We're having a party.
(     ) 5. A. Yes, it does.       B. Yes, it is.       C. No, I can't.

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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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