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Forests are important to people and animals. They give food and shelters(居所) to animals. If there are no trees, animals will have no food or shelters. They will be dead. We get many things from forests. We get food from trees. Wood is useful for making paper. All the things we get from forests are important in our daily life. We can’t live without(没有) forests. We should protect forests.
1．Forests are important to us.2．Animals will be dead without trees.
3．Trees only give food to animals.
4．Wood is useful for making paper.
5．Everything we use in our daily life comes from forests.
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
