听录音，选择正确的答语。( ) 1. A. He is a police officer.

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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 a police officer.             B. He goes to work by car.             C. He works in a school
(      ) 2. A. He works in a police office.     B. She is an English teacher            C. She works in a factory.
(      ) 3. A. She works in a bookstore.       B. She goes to work by subway.       C. She is a head teacher.
(      ) 4. A. No, he isn't.                         B. yes. he is.                                 C. yes, she is.
(      ) 5. A. He is friendly and funny.        B. He likes sports.                         C. He is a businessman.

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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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