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（1）A. It was Sunday.
B. It is Monday.
C. It’s the third of Jun.
（2）A. Yes, they are.
B. Yes, they do.
C. Yes, he is .
（3）A. Yes, I’m Nancy.
B. Yes, that is Nancy.
C. Yes, speaking .
（4）A. It’s in Jan. or Feb.
B. It’s in May.
C. It’s on the first of October.
（5）A. No, they weren’t.
B. Yes, they were.
C. Yes, there were.
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
