一、信息还原
阅读短文，从方框中选出能填入空格处的最佳选项，有两个多余选项。
Trees are the tallest living plants and can live for a very long time. But like all plants, they have a special ability: they make their own food. How do they do it?
Leaves are a tree’s food factories. They use sunlight, air and water to make food in a process called photosynthesis (光合作用). A special green material in the leaves makes this possible.
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It is so important because it catches sunlight, which is the first step in making food for the tree.
Branches (树枝) act like arms, holding up the leaves and spreading them out to catch
as much sunlight as possible. Meanwhile, inside the trunk, a network of tubes works like highways.
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This two-way system keeps the whole tree alive.
Roots do two important jobs. First, they take in water and nutrients (养分) from the soil. Second, they hold the tree firmly in the ground.
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Without this function, soil would easily be washed away when it rains.
Trees reproduce (繁殖) in different ways. Deciduous trees (落叶树) grow flowers that become seeds inside fruits or nuts. Conifers (针叶树) make cones (球果) instead of flowers.
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This stored food supports the young plant until it grows leaves and can make its own food through photosynthesis.
Trees are not just tall and quiet—they are always working. They clean the air, provide shade, and offer homes and food to animals.
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From tiny seeds to mighty (巨大的) giants, trees truly help our world stand tall.
A. Every seed has its own food inside it.
B. These seeds are often spread by wind or animals.
C. This green material is called chlorophyll (叶绿素).
D. So, scientists have long studied how trees support life.
E. Therefore, protecting trees is important for our planet.
F. They also help hold soil in place and prevent erosion (侵蚀).
G. They carry water up from the roots and food down from the leaves.
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