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Earth Day is on 22nd April. We should protect our Earth. In many places, there is not much water. We should reuse and save water. There is not much energy. We shouldn’t drive so much. We can take the bus or the metro to go to school or go to work. We should save trees. Trees can keep the air clean. We shouldn’t cut down too many trees. We should plant more trees.
1．Earth Day is on the twenty-first of April.2．We should not protect our earth.
3．There is not much water in many places.
4．We should not drive so much.
5．We should plant more trees.
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
