听录音，根据句子选择正确的答语。(听两遍)( ) 1. A. Our sandwiches.

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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，根据句子选择正确的答语。(听两遍)
(     ) 1. A. Our sandwiches.       B. Swimming.       C. Fly.
(     ) 2. A. Our hamburgers.       B. On the pond.       C. In the tree.
(     ) 3. A. Under the tree.       B. Simon and 1.       C. Playing hide-and-seek.
(     ) 4. A. Had a picnic.       B. In the park.       C. In the afternoon.
(     ) 5. A. The sun is shining.       B. They're looking at some ducks.       C. They look hungry.

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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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