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A. It's Teachers' Day today. B. It's Children's Day today. C. It's Spring Festival today.
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A. They're in the school. B. They're in the park. C. They're in the zoo.
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A. They are having a volleyball game. B. They are having a football game. C. They are having a basketball game.
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A. Miss Li and her students. B. Yang Ling and her friends. C. All of the students.
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A. She's singing. B. She's dancing. C. She's taking many photos for students.
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A. Yes, they are. B. No, they aren't. C. Yes, we are.
同类型试题
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
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