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This is the earth (地球). The green part is land. The blue part is sea. The white part is clouds. Our earth is very beautiful and interesting.
There are rivers, seas and lakes. There are hills and mountains. There are many countries and cities. There are many people living in them. Do you think the earth is very wonderful?
But people are cutting down the trees. Many wild animals, bird sand insects lose their homes. It’s very cruel (残忍). People are polluting (污染) the land, the water and the air.
People should stop doing this. We should save the earth. We should save our home.
1．Our earth is very pretty.2．There are many people in the earth.
3．People are planting more trees.
4．Many wild animals lose their homes.
5．People shouldn’t save the earth.
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
