过去 1. 生活贫困,房屋破旧。
2. 垃圾遍地,火车,小汽车很慢
现在 1. 生活:住房宽敝,明亮;有高铁,许多人有自己的汽车。
2. 环境:河水干净,到处是花草树木。
3. 旅游:每年有很多来自世界各地的游客,
hometown (家乡) poor life (贫困的生活) have one's own car (有自己的汽车)
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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