听录音，根据所听句子，选择正确的答句。(听两遍)( ) 1. A. They’re stud

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类型：听音，选择正确答案

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听录音，根据所听句子，选择正确的答句。(听两遍)
(     ) 1. A. They’re students.             B. There are thirty-six.             C. There are some desks and chairs.
(     ) 2. A. It’s an art room.             B. Yes, it is an art room.             C. They’re art rooms.
(     ) 3. A. Yes, there is.                    B. No, there aren’t.                    C. Yes, they are.
(     ) 4. A. On the first floor.             B. In the playground.             C. Behind the door.
(     ) 5. A. OK. Let’s go and have a look. B. My home is in front of our school. C. OK. Let’s go.

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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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