We all enjoy the colors of autumn leaves. Did you ever wonder how and why a fall leaf changes color? Where do the yellows and oranges come from? To answer those questions, 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 glucose, which 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 sugar is called photosynthesis, which means " putting together with light. " A chemical called chlorophyll helps make photosynthesis happen. Chlorophyll is what gives plants their green color.
As summer ends and autumn comes, the days get shorter and shorter. 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 summer. They begin to shut down their food-making factories. The green chlorophyll disappears from the leaves. As the bright green fades away, we begin to see yellow and orange colors. Small a-mounts of these colors have been in the leaves all along. Covered up by the green chlorophyll, we just can't see them in summer.
The bright reds and purples we see in leaves are made mostly in the fall. In some trees, like maples, glucose is trapped in the leaves after photosynthesis stops. Sunlight and the cool nights of autumn cause the leaves turn this glucose into a red color. The brown color of trees like oaks is made from wastes left in the leaves.
It is the combination of all these things that make the beautiful colors we enjoy in the fall.
1.The writer asked two questions in the beginning in order to .
A. persuade readers to believe something
B. introduce the topic of the passage
C. get the readers excited
D. offer something to think over
2. Which of the following is True according to the passage?
A. Trees don't change colours with seasons.
B. Trees can still perform photosynthesis well in winter.
C. Trees have colours like yellow and orange even in summer.
D. Trees don't need food in winter.
3.Photosynthesis is a way that ___________________________.
A. plants change water and carbon dioxide into sugar
B. plants turn water and carbon dioxide into sugar with the help of sunlight
C. plants use glucose as food for energy and growing
D. chlorophyll is a great help
4. Which is the best title for this passage?
A. Colorful trees in autumn B. Mysteries of tree colors
C. Do you enjoy tree colors? D. Wonderful colors in autumn
高三英语阅读理解简单题
We all enjoy the colors of autumn leaves. Did you ever wonder how and why a fall leaf changes color? Where do the yellows and oranges come from? To answer those questions, 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 glucose, which 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 sugar is called photosynthesis, which means " putting together with light. " A chemical called chlorophyll helps make photosynthesis happen. Chlorophyll is what gives plants their green color.
As summer ends and autumn comes, the days get shorter and shorter. 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 summer. They begin to shut down their food-making factories. The green chlorophyll disappears from the leaves. As the bright green fades away, we begin to see yellow and orange colors. Small a-mounts of these colors have been in the leaves all along. Covered up by the green chlorophyll, we just can't see them in summer.
The bright reds and purples we see in leaves are made mostly in the fall. In some trees, like maples, glucose is trapped in the leaves after photosynthesis stops. Sunlight and the cool nights of autumn cause the leaves turn this glucose into a red color. The brown color of trees like oaks is made from wastes left in the leaves.
It is the combination of all these things that make the beautiful colors we enjoy in the fall.
1.The writer asked two questions in the beginning in order to .
A. persuade readers to believe something
B. introduce the topic of the passage
C. get the readers excited
D. offer something to think over
2. Which of the following is True according to the passage?
A. Trees don't change colours with seasons.
B. Trees can still perform photosynthesis well in winter.
C. Trees have colours like yellow and orange even in summer.
D. Trees don't need food in winter.
3.Photosynthesis is a way that ___________________________.
A. plants change water and carbon dioxide into sugar
B. plants turn water and carbon dioxide into sugar with the help of sunlight
C. plants use glucose as food for energy and growing
D. chlorophyll is a great help
4. Which is the best title for this passage?
A. Colorful trees in autumn B. Mysteries of tree colors
C. Do you enjoy tree colors? D. Wonderful colors in autumn
高三英语阅读理解简单题查看答案及解析
Because of the Mid-autumn Day happening to _________, we have just enjoyed a longer National Day vacation than ever before, but it is estimated that it will be 38 years __________ we can experience such a coincidence again.
| A．make up, when | B．Come across, that | C．pick up, since | D．come along, before |
高三英语单项填空中等难度题查看答案及解析
Money is all surrounding us．Every day, we see it, use it, and it is on the tip of our tongue．Did you ever stop to take into consideration where the money that you carry around every day comes from?
Making new money is a very unique job and no easy task．It has up to 65 steps When the money in circulation（流通） gets dirty and worn out, it is replaced with new money The old money is taken from banks and brought to places where it is destroyed Usually, the old money is burned．The burned money is replaced by new paper money
If old money is being replaced, then new money is printed in a place called a mint（造币厂）．Large sheets 01 paper are printed with many pictures of some currency （流通货币）．These large sheets are cut into individual bills．The individual bills are then put together in big stacks and then sent to banks．
Sometimes the mint will make a new bill with a new picture （portraits of statesman and places of interest are favoured） or a new colour. It is not easy for the government to make a new bill. It takes a long time, and there are many steps to go through before a new bill can be sent to banks, first, people m the government decide that a new kind of bill is needed Then, they ask and artist to design the new bill．A different artist cuts the new picture into a soft piece of metal called a die．The dies are made and put onto large printing machines．Then, very special paper is used, which no one but the mint can have．Along with this special paper, the mint also prints currency using special colours．After the dies print the new currency onto the paper, the bills are cut, stacked, and sent off to the banks．
1.From the passage we know that
| A．banks make new money |
| B．it takes 65 procedures to make new money |
| C．mints decide what kind of bill is needed |
| D．old money that is not used is forever stored in a special place |
2.We can infer from the passage that a die is ____
| A．something for dead people |
| B．a special machine that prints the money |
| C．a special piece of paper that the money is made from |
| D．a piece of metal that puts the picture on the money |
3.'Which of the following shows the right order of dealing with new money?
①New money is printed in a mint．
②Bills are cut from large sheets of special paper．
③New money is sent in large amounts to banks．
④The government decides to make new money．
| A．①②③④ | B．④③②① | C．④①③② | D．④①②③ |
4.Which of the following is NOT mentioned in the passage?
| A．The reason for making new money． |
| B．The processes of making a new bill． |
| C．The amount of new money needed． |
| D．Things used．to make new money or a new bill． |
高三英语阅读理解中等难度题查看答案及解析
23．—It was careless of you___________your car unlocked all night.
—Oh, dear! .
| A．to leave; So did I | B．leaving ; So did I |
| C．to have left; So I did | D．having left; So I did |
高三英语单项填空简单题查看答案及解析
—It was careless of you________your bag outside all night.
—My God!________.
A．to leave, So did I B．leaving, So do I
C．to have left, So I did D．having left, So I do
高三英语单项填空中等难度题查看答案及解析
Color permeates(渗透)all aspects of our lives．It shapes how we sense the world，and benefits our health and mind．
1.．color has a significant impact on our lives．For starters，it can make us less violent.
Being comforted—and confident
When you need some comforting and confidence，orange is what you need.
“It combines the energy of red and the happiness of yellow，”said Sara Petitt，a scientist at the Fashion Institute of Technology．
He called orange the happiest color，and described it as“red brought nearer to humanity by yellow．” 2.．That is the power of orange．
Removing fear
Most human cultures dislike the color of black．Experts argue that we need black to make our wardrobes radiate sophistication but also to overcome our fears．
“In the dark，our visual sense vanishes．3. ．We rely on our visual system to help protect us from harm，”said Antony，a psychology professor．But black is not as dark as we think．French artist Renoir called black the queen of all colors．
The color of your body—and love
Red is our color．Our bodies produce 2 million red blood cells every single second．We need the color red because it has a powerful effect on our brains．Scientific studies have found that the color makes us stronger，more alert，more competitive．
4.，many of us get red in the face from increased blood flow．
Red can also make us appear more attractive to one another，which is why red lipstick is on billions of lips．
Keeping you healthy and calm
Our eyes can detect light between wavelengths of 400 and 700 nanometers，a range known as the visible spectrum(光波)．In the middle of the spectrum resides green．5.．The color green also keeps us calm，which is one of the reasons why there is so much of green in many hospitals．
A．Color directly influences the soul
B．Even though we have not realized it
C．We all have different relationships with colors
D．When we are shy，angry and excited
E．We are unable to detect who or what is around us
F．This wavelength is where our sense is at its best-and keeps us fit
G．Imagine the relief you feel soaking in the beauty of a dramatic sunset
高三英语七选五中等难度题查看答案及解析
—Did you enjoy meeting your old schoolmates at the party last week?
—Yes, I did. We ________ each other since we graduated from college.
A．haven't seen B．didn't see
C．hadn't seen D．wouldn't see
高三英语单项填空中等难度题查看答案及解析
—Did you enjoy your journey to the town?
— _______. We had driven more than 3 hours before we found the right way.
| A．Absolutely | B．No way |
| C．Not at all | D．Quiet a lot |
高三英语单项填空困难题查看答案及解析
—Did you enjoy your journey to the village?
— __________．We had driven more than 3 hours before we found the right way．
A．Of course B．Quite a lot C．Not exactly D．No problem
高三英语单项填空中等难度题查看答案及解析
Have you ever seen any trees ________ leaves were black because of the polluted air?
A．whose B．that
C．which D．who
高三英语单项填空简单题查看答案及解析