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World Environment Day （WED） falls on June 5 each year. It focuses on improving the environment all over the world. （1）WED is created to get people’s attention to the environment. Also, people are encouraged to express their thoughts about the environment. People are asked to change attitudes （态度） towards environmental problems.（2）All nations and people can enjoy a safer and more beautiful future by working together.
With the development of China, our government is more and more enthusiastic （热衷的） about protecting the environment. （3）The forest of China has already become the first place in the world, about 2 hundred million hectares （公顷）. Our lives are greener and greener.
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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
