听录音，选择正确的答句。(听两遍) ( ) 1. A. He is a doctor.

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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，选择正确的答句。(听两遍)
(      ) 1. A. He is a doctor.               B. She is a teacher.          C. I'm a boy.
(      ) 2. A. It's half past eight.          B. At 7 o'clock.               C. It's eight o'clock.
(      ) 3. A. Yes, I am.                      B. Yes, you are.             C. No, you aren't.
(      ) 4. A. Yes, she is.                    B. Yes, he is.                 C. No, she isn't.
(      ) 5. A. Yes, you will.                 B. Yes, I am.                 C. Yes, I will.

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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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