听问题，选择正确的应答。( ) 1. A. The mouse is.

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听问题，选择正确的应答。
(     ) 1. A. The mouse is.                    B. The mouse does.                C. The mouse did.
(     ) 2. A. I’m fine.                          B. Thanks.                            C. OK.
(     ) 3. A. Yes, they do.                    B. No, they don’t.                     C. They like it.
(     ) 4. A. No, it isn’t.                    B. That’s good.                     C. Yes, it is.
(     ) 5. A. We must talk loudly.   B. We must keep quiet.         C. We must eat and drink.

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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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