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Our school life was different in China three years ago. We studied in a small classroom. There were some old desks and chairs. There was a small blackboard. There were only two lights in the classroom. Now we study in a big classroom. We have got many new desks and chairs. We have got a big blackboard. And there are ten lights in our classroom. It's very bright (明亮的). I love my school life.
1．There were some new desks and chairs three years ago.2．They have got new desks and chairs now.
3．The classroom is very bright now.
4．There are eight lights in our classroom.
5．Now we study in a small classroom.
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
