英语阅读理解Do you want to know how and why a fall leaf

英语阅读理解Do you want to know how and why a fall leaf

Do you want to know how and why a fall leaf changes color? We first have to understand what leaves are and what they do.
        Leaves are the world’s food factories. Plants take water from the ground through their roots and take CO2 from the air. Plants use sunlight to turn water and CO2 into glucose(葡萄糖), a kind of sugar. Plants use it as food for energy and growing.
        A chemical called “chlorophyll” in the leaves gives plants their green colour. As summer ends and autumn comes, the days get shorter and shorter, and trees “know” to begin getting ready for winter.
        During winter, there is not enough sunlight or water. Trees rest during this time and live on the food they store during the summer. They begin to shut down their food-making factories. As the green chlorophyll disappears from the leaves, we begin to see yellow and orange leaves.
        The bright reds and purples we see in leaves are made mostly in autumn. In some trees, like maples(枫树), sunlight and the cool nights of autumn turn the glucose in the leaves into a red colour. And we can enjoy the beautiful red leaves during autumn.
1
The underlined word “chlorophyll” means __________.
A. 蛋白质
B. 脂肪
C.叶绿素
D.淀粉
纠错查看原文
2
The leaves turn yellow because they are short of __________.
A.sunlight and water
B. glucose and energy
C. water and CO2
D. sunlight and CO2
纠错查看原文
3
. Which of the following is NOT true?
A.When autumn comes, the days get shorter and shorter．
B.Trees begin to stop making food in summer．
C.During winter some of yellow and orange colors are still in the leaves．
D.During winter trees live on the food they store in summer．
纠错查看原文
4
This passage tells us_____________．
A.the plants can grow well only with the sunlight
B.there are all kinds of plants on the earth
C.maple leaves change the color as other trees
D.not all the colors of the leaves are from chlorophyl追答出来CADD

？？？

你想知道如何和为什么秋天叶子追答不过这英语句子的确怪怪的

Do you want to know how and why a fall leaf changes color? We first have to understand what leaves are and what they do. Leaves are the world’s food factories. Plants take water from the ground through their roots and take CO2 from the air. Plants use sunlight to turn water and CO2 into glucose(葡萄糖), a kind of sugar. Plants use it as food for energy and growing. A chemical called
“chlorophyll” in the leaves gives plants their green colour. As summer ends and autumn comes, the days get shorter and shorter, and trees “know” to begin getting ready for winter. During winter, there is not enough sunlight or water. Trees rest during this time and live on the food they store during the summer. They begin to shut down their food-making factories. As the green chlorophyll disappears from the leaves, we begin to see yellow and orange leaves. The bright reds and purples we see in leaves are made mostly in autumn. In some trees, like maples, sunlight and the cool nights of autumn turn the glucose in the leaves into a red colour. And we can enjoy the beautiful red leaves during autumn.

9.Which should be in the box? sunlight+ +CO2 glucose A. air B. sugar C. water D. wind
10.The underlined word “chlorophyll” means __________. A. 叶绿素 B. 脂肪 C.蛋白质 D.淀粉
11.The leaves turn yellow because they are short of(缺少) __________. A. water and CO2 B. glucose and energy C. sunlight and water D. sunlight and CO2
答案CDC

这篇阅读理解的原题是：
Do you want to know how and why a fall leaf changes color? We first have to understand what leaves are and what they do.
Leaves are the world’s food factories. Plants take water from the ground through their roots and take CO2 from the air. Plants use sunlight to turn water and CO2 into glucose(葡萄糖), a kind of sugar. Plants use it as food for energy and growing.
A chemical called “chlorophyll” in the leaves gives plants their green colour. As summer ends and autumn comes, the days get shorter and shorter, and trees “know” to begin getting ready for winter.
During winter, there is not enough sunlight or water. Trees rest during this time and live on the food they store during the summer. They begin to shut down their food-making factories. As the green chlorophyll disappears from the leaves, we begin to see yellow and orange leaves.
The bright reds and purples we see in leaves are made mostly in autumn. In some trees, like maples(枫树), sunlight and the cool nights of autumn turn the glucose in the leaves into a red colour. And we can enjoy the beautiful red leaves during autumn.
1
The underlined word “chlorophyll” means __________.
A. 蛋白质
B. 脂肪
C.叶绿素
D.淀粉
2
The leaves turn yellow because they are short of __________.
A.sunlight and water
B. glucose and energy
C. water and CO2
D. sunlight and CO2
3
. Which of the following is NOT true?
A.When autumn comes, the days get shorter and shorter．
B.Trees begin to stop making food in summer．
C.During winter some of yellow and orange colors are still in the leaves．
D.During winter trees live on the food they store in summer．
4
This passage tells us_____________．
A.the plants can grow well only with the sunlight
B.there are all kinds of plants on the earth
C.maple leaves change the color as other trees
D.not all the colors of the leaves are from chlorophyl
接下来我们分题解析
第一题：
这题问的是chlorophyll这个词的意思。原文中提到 A chemical called “chlorophyll” in the leaves gives plants their green colour. 意思是“chlorophyll”这种物质使植物的叶子呈现绿色。根据常识可判断出，chlorophyll是叶绿素的意思，所以这题选C。
第二题：
这题问的是叶子会变黄是因为它们缺乏什么物质。由原文中 During winter, there is not enough sunlight or water. 一句可知，叶子会变黄是因为缺乏阳光和水，所以这题选A。
第三题：
这题问的是选项中哪句句子是不对的。由原文中Trees rest during this time and live on the food they store during the summer.一句可知，树在冬天依靠夏天储存下来的食物过活。而B选项说，树在夏天就停止制造食物，这显然是不对的。所以这题选B
第四题：
这道题问这篇文章告诉了我们什么。通览全文可知，这是一篇说明文，主要告诉了读者树叶为什么会变成其他的颜色。而D选项的意思则是并非所有叶子的颜色都来自叶绿素，在所有选项中最接近文章的大意，故而这题选D。

Do you want to know how and why a fall leaf changes color? We first have to understand what leaves are and what they do.
        Leaves are the world’s food factories. Plants take water from the ground through their roots and take CO2 from the air. Plants use sunlight to turn water and CO2 into glucose(葡萄糖), a kind of sugar. Plants use it as food for energy and growing.
        A chemical called “chlorophyll” in the leaves gives plants their green colour. As summer ends and autumn comes, the days get shorter and shorter, and trees “know” to begin getting ready for winter.
        During winter, there is not enough sunlight or water. Trees rest during this time and live on the food they store during the summer. They begin to shut down their food-making factories. As the green chlorophyll disappears from the leaves, we begin to see yellow and orange leaves.
        The bright reds and purples we see in leaves are made mostly in autumn. In some trees, like maples(枫树), sunlight and the cool nights of autumn turn the glucose in the leaves into a red colour. And we can enjoy the beautiful red leaves during autumn.

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