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In Australia, National Tree Day is on the last Sunday in July. In China, Tree Planting Day is on 12th March. Trees are very important in our life. Trees make our city beautiful. We can get a lot of things from trees. We get fruit from trees. We also get wood from trees. We use wood to make pencils, desks and chairs. We can use wood to make paper ,too. Trees can keep the air clean. They can cool the air, too. So we should love trees. We should plant more trees.
1．In China, Tree Planting Day is on 12th March. （_______）2．Trees are useful for us. （_______）
3．We should cut down more trees. （_______）
4．Trees can’t keep the air clean. （_______）
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
