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I live in a small town with dirty air all around before. There was no tall buildings and the roads were narrow(狭窄的). There were not many cars or taxis on the road but the traffic was OK then.
Today, there are tall buildings, big shopping malls and factories(工厂) everywhere. The roads are big and there are so many cars and taxis. We have more parks and the air is much cleaner. But in some places, with the development(发展) of the industry(工业), we have fewer trees. Air and water pollution(污染) is becoming more and more serious(严重的). We must do something to stop pollution and make our town more beautiful.
1．I live in a small town with clean air before.2．There were many cars and taxis on the road before.
3．There are tall buildings everywhere.
4．With the development of the industry, we have more trees.
5．We must make our town more beautiful.
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
