听录音，根据句子选择正确的答语。(听两遍) ( ) 1. A. I clean my roo

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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. I clean my room.       B. I'm cleaning my room.       C. Yes, I am.
(     ) 2. A. Yes, we are.       B. We're playing hide-and-seek.       C. We are in the mountains.
(     ) 3. A. It rained.       B. It's raining.       C. Yes, it is.
(     ) 4. A. Under the tree.       B. Yes, they are.       C. They're sleeping.
(     ) 5. A. No, they aren't.       B. Yes, they are.       C. Yes, I am.

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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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