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（1）A. He’s a teacher.
B. Yes, she is.
C. Yes, she’s my teacher.
（2）A. My name is Tom.
B. Her name is Sarah.
C .This is Sarah.
（3）A. No, they aren’t.
B. Yes, they aren’t.
C. No, they are.
（4）A. It’s a schoolbag.
B. Some books and pens.
C. It’s red.
（5）A. There are 9.
B. They’re in the room.
C. They are 9.
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
