听音，根据语音语调选择你所听到的句子。( ) 1. A. Is this the teach

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类型：听音，选择听到的内容

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所属科目：小学英语

听音，根据语音语调选择你所听到的句子。
(     ) 1. A. Is this the teacher’s office?            B. This is the teacher’s office.
(     ) 2. A. They are under the desk.               B. Are they under the desk?
(     ) 3. A. What would you like for dinner?     B. What would he like for dinner?
(     ) 4. A. The library is on the second floor.       B. Is the library on the second floor?
(     ) 5. A. There are many people in my family.       B. How many people are there in your family?

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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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