听句子，选答语。（______）1.A. It's a camel. B. Yes

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听句子，选答语。
（______）1.A. It's a camel.          B. Yes, please.          C. They are camels.
（______）2.A. It's a dog.          B. They're cats.          C. It's so tall.
（______）3.A. We want to go to the farm.         B. We want some beef.         C. It's a farm.
（______）4.A. No, it isn't.           B. Yes, it is.          C. Yes, they are.
（______）5.A. It's a seal.          B. It's Sunday.          C. They're seals.

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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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