听录音，根据所听句子，选择正确的答句。( ) 1. A. A ball.

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类型：听音，选择正确答案

难度系数：0.85

所属科目：小学英语

听录音，根据所听句子，选择正确的答句。
(     ) 1. A. A ball.             B. It's on the table.             C. It's red.
(     ) 2. A. I can see a rubber on the box.        B. I can see a toy car in the box.          C. I can see a river in the park.
(     ) 3. A. I can see a tree and some flowers.        B. I like this picture.        C. I can draw a picture.
(     ) 4. A. I see a bird in the tree.        B. I have a singing lesson.        C. I can sing too.
(     ) 5. A. It's ten to ten.        B. It's time for dinner.        C. I usually go to bed at ten.

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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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