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Thirty years ago, this school was small. There were about 300 students at that time. There was a library, but there weren’t so many books in it. Now, it is a big and beautiful school. There are about 2000 students. The library is very big and clean. Students can read many books in it. There is also a computer room now. There are many big trees beside the playground. After class, we often do sports and play games on it.
1．This school was small twenty years ago.2．There were about 300 students.
3．There is a big and clean library in the school.
4．There are many big trees beside the computer room.
5．We often do sports and play games on the playground.
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
