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Peter: Ilike trees. They make our city beautiful.
Joe: Yes. They’re important. We get a lot of things from trees.
Peter: We get fruit from trees.
Joe: We also get wood from trees.
We use wood to make pencils, desks and chairs.
Peter: We use wood to make paper too.
Joe: Trees can keep the air clean. They can cool the air too.
Peter: Really? That’s wonderful! We should plant more trees.
| Trees help us in many ways. ________________________________________ ________________________________________ ________________________________________ ________________________________________ ________________________________________ Trees are important in our life. We should plant more trees! Come and help us 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
