听录音，根据所听句子，选择正确的答句。( ) 1. A. Yes, I can.

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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，根据所听句子，选择正确的答句。
(     ) 1. A. Yes, I can.                    B. They are over there.             C. They are flowers.
(     ) 2. A. He can see a pen.            B. No, I can't.                       C. I can make a cake.
(     ) 3. A. Is this a boat?                 B. It's on the river.                  C. I can see the boat.
(     ) 4. A. Thank you.                    B. Good idea!                       C. That's OK.
(     ) 5. A. I can see a big tree.          B. Look at the big tree.               C. The tree is tall and green.

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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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