听录音，选择合适的答句。( ) 1. A. At seven. B.

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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，选择合适的答句。
(     ) 1. A. At seven.             B. In the morning.            C. On Sunday.
(     ) 2. A. I am singing.     B. I danced.          C. I am going to play football.
(     ) 3. A. Yes, I do            B. No, I didn’t.        C. Yes, I am.
(     ) 4. A. Yes, he did            B. Yes, she did.               C. Yes, they did.
(     ) 5. A. My mother is.   B. My mother does.        C. My mother did.

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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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