听录音，根据所听句子，选择正确的答句。(听两遍) ( ) 1. A. They are t

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类型：听音，选择正确答案

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听录音，根据所听句子，选择正确的答句。(听两遍)
(      ) 1. A. They are too small.          B. It's too small.          C. Try this.
(      ) 2. A. Try these.          B. Try this.          C. They're too short.
(      ) 3. A. She is Su Yang.          B. It's Su Yang's.          C. They're Su Yang's.
(      ) 4. A. Yes, it's Dan's.          B. Yes, they're Dan's.          C. Yes, he's Dan.
(      ) 5. A. Let's go.          B. All right.          C. I'm sorry.

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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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