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Trees are important in our everyday life. Trees help clean the air. They give us oxygen (氧气) so we can breathe (呼吸) fresh air every day. The Green leaves need sunshine to make food for trees. Because of trees, we can have food like apples, bananas and oranges. We can also make and build things with trees, such as chairs, beds and houses. The most important thing is that plants cover (覆盖) the soil. They can stop the wind from blowing (吹) the soil away.
Trees are very important. We need trees and we should plant more.
1. What’s the most important thing about plants?
2. Can you give an example (例子) of the importance (重要性) of plants to us?
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
