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Choose the best answer(根据短文内容，选择最恰当的答案)
There are many kinds of trees, but they are alike in some ways. All trees have trunks. All trees have branches. All trees have leaves or needles. All trees have roots. Trees have many shape. Some trees look like a circle. Some trees look like a triangle.
All trees have trunks. The trunk of a tree gets bigger as it grows. All trees have leaves. The leaves of all trees do not look alike. Many trees lose their leaves in the fall. They grow new ones in the spring. The needles stay green all the time. When the needles fall off, some new needles grow. All trees have roots. The roots help hold the tree in the ground. The water from the soil goes into the roots to help the tree grow. All trees have seeds. They do not all look alike. New trees grow from the seeds.
Some animals use the seeds for food. Some animals make their homes in the trunk of tree. Birds make their home on the branches of a tree. Trees can keep us cool. It is much cooler to sit in the shade of a tree than it is to sit in the hot sun. Many trees are cut down for us to use. We use the wood in our fireplace so we can keep warm. We use the wood to make paper. We also use the wood from trees to build houses. Children use trees for fun, too.
