Do you want to know how and why a fall leaf c...

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 CO2into 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.

1.Which should be in the box? sunlight++CO2glucose

A.air B.sugar C.water D.wind

2.The underlined word “chlorophyll” means __________.

A.叶绿素 B.脂肪 C.蛋白质 D.淀粉

3.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

4.Which of the following is NOT true?

A.When autumn comes, the days get shorter and shorter.

B.During winter trees live on the food they store in summer.

C.During winter some of yellow and orange colors are still in the leaves.

D.Trees begin to stop making food in summer.

5.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.not all the colors of the leaves are from chlorophyll

D.maple leaves change the color as other trees

九年级英语阅读单选困难题查看答案及解析

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.

1.Which should be in the box?　

A. air　　　　 B. sugar　　　　 C. water　　　　　　 D. wind

2.The underlined word “chlorophyll” means __________.

A.叶绿素　　　 B. 脂肪　　　　　 C.蛋白质　　　　　　 D.淀粉

3.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

4.Which of the following is NOT true?

A. When autumn comes, the days get shorter and shorter.

B. During winter trees live on the food they store in summer.

C. During winter some of yellow and orange colors are still in the leaves.

D. Trees begin to stop making food in summer.

5.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. not all the colors of the leaves are from chlorophyll

D. maple leaves change the color as other trees

九年级英语阅读理解中等难度题查看答案及解析

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.

1.Which should be in the box?

A.air　　　　 B. sugar　　　　 C. water　　　　　　 D. wind

2.The underlined word “chlorophyll” means __________.

叶绿素　　　 B. 脂肪　　　　　 C.蛋白质　　　　　　 D.淀粉

3.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

4.Which of the following is NOT true?

A.When autumn comes, the days get shorter and shorter.

B.During winter trees live on the food they store in summer.

C.During winter some of yellow and orange colors are still in the leaves.

D.Trees begin to stop making food in summer.

5.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.not all the colors of the leaves are from chlorophyll

D.maple leaves change the color as other trees

九年级英语阅读理解中等难度题查看答案及解析

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.

1.Which should be in the box?　　 sunlight+ +CO2 　　 glucose

A. air　　　　 B. sugar　　　　 C. water　　　　　　 D. wind

2.The underlined word “chlorophyll” means __________.

A.叶绿素　　　 B. 脂肪　　　　　 C.蛋白质　　　　　　 D.淀粉

3.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

4.Which of the following is NOT true?

A. When autumn comes, the days get shorter and shorter.

B. During winter trees live on the food they store in summer.

C. During winter some of yellow and orange colors are still in the leaves.

D. Trees begin to stop making food in summer.

5.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. not all the colors of the leaves are from chlorophyll

D. maple leaves change the color as other trees

九年级英语阅读理解中等难度题查看答案及解析

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 color. 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 food­making 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 color. And we can enjoy the beautiful red leaves during autumn.

1.Which should be in the box?

sunlight＋＋CO2→glucose

A. air　　 B. sugar　　 C. water

2.The underlined word “chlorophyll” means “　　　　　 ”．

A. 蛋白质　　 B. 脂肪　　 C. 叶绿素

3.The leaves turn yellow because they are short of 　　　　　 .

A. sunlight and water

B. glucose and energy

C. water and CO2

4.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 the yellow and orange colors are still in the leaves.

九年级英语阅读单选中等难度题查看答案及解析

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.

1.Which should be in the box?

A. air　　　　 B. sugar　　　　 C. water　　　　　　 D. wind

2.The underlined word “chlorophyll” means __________.

A. 叶绿素　　　 B. 脂肪　　　　　 C.蛋白质　　　　　　 D.淀粉

3.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

4.Which of the following is NOT true?

A. When autumn comes, the days get shorter and shorter.

B. During winter trees live on the food they store in summer.

C. During winter some of yellow and orange colors are still in the leaves.

D. Trees begin to stop making food in summer.

5.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. not all the colors of the leaves are from chlorophyll

D. maple leaves change the color as other trees

九年级英语阅读理解中等难度题查看答案及解析

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 ）

____________________________________________________.

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

____________________________________________________.

3.Translate the underlined sentence into English.

____________________________________________________.

4.Translate the underlined sentence into proper Chinese.

____________________________________________________.

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

____________________________________________________.

九年级英语阅读理解中等难度题查看答案及解析

Do you know ________ yesterday? I want to know the reason.

A.why did he leave B.how he left C.why he left D.how did he leave

九年级英语单选题中等难度题查看答案及解析

---Do you know 　　　　　　　　　　　　　　　 second-hand smoke?

---To protect our health and memory.

A. how we should prevent　　　　　　 B. why should we prevent

C. why we should prevent　　　　　　 D. whether we should prevent

九年级英语单项填空中等难度题查看答案及解析

---Do you know 　　　　　 second-hand smoke?

---To protect our health and memory.

A. how we should prevent　　　　　　 B. why should we prevent

C. why we should prevent　　　　　　 D. whether we should prevent

九年级英语单项填空简单题查看答案及解析