听录音，选出合适的答语。( ) 1. A. It's time to go to bed.

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类型：听音，选择正确答案

难度系数：0.65

所属科目：小学英语

听录音，选出合适的答语。
(     ) 1. A. It's time to go to bed.             B. It's 7: 30.
(     ) 2. A. It's hot and sunny.                  B. It's six o'clock.
(     ) 3. A. Yes, I do.                              B. Yes, it is.
(     ) 4. A. It's on the first floor.               B. That is the library.
(     ) 5. A. No, it isn't.                           B. No, you 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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