听录音，选择正确的答语。( ) 1. A. He is seven years old.

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类型：听音，选择正确答案

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听录音，选择正确的答语。
(     ) 1. A. He is seven years old.                           B. He is thin and short.                    C. He is a student.
(     ) 2. A. My father is a police officer.             B. He works very hard.                    C. He works in a factory.
(     ) 3. A. She goes to work by bus.                    B. She is a cleaner.                           C. She has a very healthy life.
(     ) 4. A. He is a coach.                                        B. He likes playing football.                    C. He is good at basketball.
(     ) 5. A. She is going to the cinema.              B. She wants to be a teacher.                     C. He wants to work in a gym.

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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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