题目内容
可溶性的固体物质在水中带快慢与（ ）等因素有关。
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幼儿科学教育的核心在于（）
Why are leaves on trees different colors? What makes them change color?Making foodLeaves make food for the tree from 1, water, and air. Green stuff in the leaves helps them make food. It also makes the leaves green.
SummmerLeaves are green in summer because they are making food. The tree 2 some of the food for winter.
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.
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