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This is a new classroom. It's very big. The walls are white. The pictures are on the wall. The floor is clean. We have twenty desks and nineteen chairs. They are blue. The teacher's desk is near the window. A new computer is on it. The windows are blue. You can see six green lights. I like the classroom. We should(应该) clean it every day.
1．The floor isn't clean.2．We have 20 desks and chairs in the classroom.
3．The desks and chairs are orange.
4．A new computer is on the teacher's desk.
5．The lights are green.
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
