题目内容：

阅读表达（共5小题；每小题2分，满分10分）

阅读下面的短文，并根据文章后的要求答题。（请注意问题后的词数要求）

Why do leaves change color in the fall? To answer this question, we first have to understand what leaves are and what they do. Leaves are nature's food factories. Plants take water from the ground through their roots. They take a gas called carbon dioxide from the air. Plants use sunlight to turn water and carbon dioxide into oxygen（氧气）and glucose（葡萄糖）. Oxygen is a gas in the air that we need to breathe. Glucose is a kind of sugar. Plants use glucose as food for energy and as a building block for growing. The way plants turn water and carbon dioxide into oxygen and sugar is called photosynthesis(光合作用). That means "putting together with light." A chemical called chlorophyll（叶绿素）helps make photosynthesis happen. Chlorophyll is what gives plants their green color.

(83)随着夏天的结束秋天的到来，天变得越来越短。This is how the trees "know" to begin getting ready for winter.

During winter, there is not enough light or water for photosynthesis. The trees will rest, and live off the food they stored during the summer. They begin to shut down their food-making factories. The green chlorophyll disappears from the leaves. ( 84)As the bright green goes away, we begin to see yellow and orange colors. Small amounts of these colors have been in the leaves all along. We just can't see them in the summer, because they are covered up by the green chlorophyll.

1.What do the plants change water and carbon dioxide into with the help of the sunlight? （no more than 5 words ）

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2. What gives the plant green color? （no more than 2 words ）

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3.Translate the underlined sentence into English.

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4.Translate the underlined sentence into proper Chinese.

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5.What does this passage mainly tell us? （no more than 15 words）

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