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（1）A. A board, ten fans, many desks and chairs.
B. A pen, two erasers and a crayon.
C. A pencil-case and ten books.
（2）A. It’s under the desk.
B. It’s on the plate.
C. It’s in the door.
（3）A. Good job. B. All right. C. Good idea.
（4）A. No, she isn’t. B. Yes, it is. C. Yes, they are.
（5）A. Thank you. B. Here you are. C. Me too.
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
