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

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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，选择正确的答句。（听两遍）
(      ) 1. A. All right.                      B. Well done!                       C. What a pity!
(      ) 2. A. This is Liu Tao.             B. They're Liu Tao's.             C. It's Liu Tao's.
(      ) 3. A. Yes, it is.                      B. No, it isn't.                       C. No, they aren't.
(      ) 4. A. Try these.                      B. Try this.                           C. It's OK.
(      ) 5. A. It's big.                         B. It's yellow.                       C. It's small.

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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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