听录音，选出你所听到的句子。( ) 1. A. Welcome back to schoo

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类型：听音，选择听到的内容

难度系数：0.85

所属科目：小学英语

听录音，选出你所听到的句子。
(      ) 1. A. Welcome back to school.                           B. Welcome to my home.
(      ) 2. A. I have a bag on the back.                           B. A sack is on the rock.
(      ) 3. A. There is a picture on the wall.                    B. There isn’t a picture on the wall.
(      ) 4. A. Sixty-two plus two is Sixty-four.             B. Sixty-two minus nine is fifty-three.
(      ) 5. A. The woman next to him is my aunt.             B. The man next to him is my uncle.

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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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