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英文 高中

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高中英文綜合應用(上 @Unit 1 閱讀 EXAMPLE 1 autumn. How does this happen? Pat 1 閱讀測驗、文意選填 We all enjoy the beautiful show of leaves as they change colors each Trees take water from under the ground and they take a gas called carbon dioxide from the air. They then use sunlight to turn water and carbon dioxide into glucose, a kind of sugar. They need glucose as food for growing. The way they turn water and carbon dioxide into glucose is called chlorophyll helps make photosynthesis happen. Chlorophyll is what gives photosynthesis, which means “putting together with light." A chemical called leaves their green color. As summer ends and autumn comes. The days get shorter and shorter This is how trees “know” to begin getting ready for winter. During winter, there is not enough light or water for photosynthesis. Trees will rest and live off the food they stored during summer. They begin to shut down their food-making factories. The green chlorophyll disappears from the leaves and we begin to see yellow and orange colors. In fact, small amounts of these colors have been in the leaves all the time. We just cannot see them in summer, because they are covered up by the green chlorophyll. In some trees, like maples, glucose is kept in the leaves after photosynthesis stops. The cool nights of autumn turn glucose into a red color. Thus, all the reasons above explain why we can see such beautiful changing colors of leaves in autumn. [2004 九月北模第一次) = 1 L 《筆記間 carbon dioxide 1 glucose in the photosynthesis 4 7 3 1 E A chlorophyll and shut down Pigt

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