听录音，选出正确的答语。( ) 1. A. They’re theirs.

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类型：听音，选择正确答案

难度系数：0.65

所属科目：小学英语

听录音，选出正确的答语。
(      ) 1. A. They’re theirs.             B. Yes, they are.            C. It’s theirs.
(      ) 2. A. It’s in December. B. It’s on September 10th. C. It’s at nine o’clock.
(      ) 3. A. She often goes for a walk.
B. He is listening to music.
C. She is cooking dinner.
(      ) 4. A. It’s spring.              B. It’s summer.              C. It’s autumn.
(      ) 5. A. No, he isn’t.              B. Yes, she is.              C. He’s playing.

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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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