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VivianOur life is changing. Ten years ago, the city was very old. There weren’t many trees. We lived in an old house. People in the city went to work on foot or by bike. Many people didn’t have cars. Now the city is very different from the past. It’s very beautiful. There are many tall buildings. I love the city.
1．The city is very old now.2．There were many trees in the city ten years ago.
3．In the past, many people didn’t go to work by car.
4．The city is changing.
5．There are many tall buildings in the city now.
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
