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（1）A: Yes, it isn’t.
B: No, it’s not.
C: No, it’s white.
（2）A：It’s purple.
B: They’re red.
C: It’s a jacket.
（3）A: It’s on the first floor.
B: It’s Jack’s.
C: They’re three.
（4）A：It’s 13 yuan.
B: It’s 6:00.
C: There are eight.
（5）A: Yes, it is.
B: It’s twelve o’clock.
C: It’s time go to bed.
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
