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（1）A. It’s on the wall.
B. It means No parking.
C. No, it doesn’t.
（2）A. No, I can’t.
B. Sorry, you can’t.
C. No, it isn’t.
（3）A. We had a big dinner.
B. Yes, I did.
C. I buy some fireworks.
（4）A. Yes, we are.
B. Sometimes it is.
C. No, it’s clean.
（5）A. Plant some trees.
B. Move away the factories.
C. Drive a lot.
（6）A. Smoke from cars.
B. My dirty clothes.
C. I should sweep the floor.
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
