听录音，选出你所听到的句子。听两遍。( ) 1. A. I see nine birds.

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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。听两遍。
(      ) 1. A. I see nine birds.                           B. I see nineteen birds.
(      ) 2. A. Let’s have a race.                           B. Let’s buy a kite.
(      ) 3. A. The blue one is a bird.                    B. The black one is a kite.
(      ) 4. A. My legs have ten toes.                         B. My hand has five fingers.
(      ) 5. A. How many cars do you see?              B. How many cars do you have?

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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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