听录音，根据所听句子，选出正确的答句。(听两遍) ( ) 1. A. Yes, it is.

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类型：听音，选择正确答案

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所属科目：小学英语

听录音，根据所听句子，选出正确的答句。(听两遍)
(     ) 1. A. Yes, it is.               B. No, it isn't.       C. It's a banana.
(     ) 2. A. I have two.               B. Yes, I do.            C. Yes, please.
(     ) 3. A. Yes, it is.                  B. No, thanks.        C. Here you are.
(     ) 4. A. It's a pineapple.          B. Yes, they are.     C. They are grapes.
(     ) 5. A. Yes, I have a mango.   B. I have two.        C. Two, please.

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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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