根据所听到的问题，选择正确答案。( ) 1. A. Yes, he does.

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类型：听音，选择正确答案

难度系数：0.65

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根据所听到的问题，选择正确答案。
(      ) 1. A. Yes, he does.                            B. Yes, he could.             C. No, he didn’t.
(      ) 2. A. We have to move the two mountains away.
B. We live in front of the mountains.
C. My old friend can help us.
(      ) 3. A. It’s sunny.                                     B. It was cloudy.                 C. It was Friday.
(      ) 4. A. I had a good time with my friends.   B. I got many presents.        C. I lost my kite.
(      ) 5. A. Yes, they were.                              B. Yes, there were.             C. No, they weren’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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