听录音，选择你所听到的内容。( ) 1. A. What’s this?

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类型：听音，选择听到的内容

难度系数：0.85

所属科目：小学英语

听录音，选择你所听到的内容。
(     ) 1. A. What’s this?              B. What’s that?            C. Who’s this?
(     ) 2. A. Good morning.          B. Good morning.          C. Good night.
(     ) 3. A. There is a funny monkey.   B. There is a funny duck.
C. There is a funny dog.
(     ) 4. A. I can jump high.   B. I can fly high.                C. I can run fast.
(     ) 5. A. She wears a black sweater.   B. He wears a black sweater.
C. She wears a white sweater.

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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

用户名称

2019-09-19

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