听录音，选出你所听到的句子。( ) 1. A. We have a new friend

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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，选出你所听到的句子。
(       ) 1. A. We have a new friend.        B. This is my new friend.
(       ) 2. A. He’s my brother.          B. He’s my teacher.
(       ) 3. A. Look at that monkey. It’s fat.       B. Look at that bear. It’s fat.
(       ) 4. A. Put your foot under your chair.       B. Put your hand on your chair.
(       ) 5. A. I like pears.       B. I like bananas.

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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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