题目内容
SummmerLeaves are green in summer because they are making food. The tree 2 some of the food for winter.
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FallIn fall, the weather 3 . The days get shorter, and the nights get longer. Trees get less sunlight, so they make less food. The leaves stop making the green color. Other colors that were under the green start to show. Leaves turn yellow, orange, brown, and red.
WinterTrees 4their leaves to get ready for winter. They use the food they saved to get through the cold days and nights.
SpringSpring comes. Ice and snow 5 , and rain falls. The sun shines. New leaves grow on the trees. The green leaves start making food again.
当土质良好时,堆土或材料应距挖方边缘()m以外，高度不宜超过（）m。
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