It’s a sure sign that summer is over and winter is on the way — leaves that were once deep green turn red, yellow and bright orange. It happens every autumn. But did you ever wonder why?
The leaves start changing color when the nights start getting longer and the temperature starts getting cooler. Some scientists think that as the number of daylight hours shrinks, the leaves stop making chlorophyll which makes plants green. The reason is that the process of making chlorophyll requires sunlight. But according to horticulture (园艺) educator Susan Rose from Colorado State University, it turns out leaves don’t really change color at all. “The fall colors are actually there all along,” she said. “But they are covered by the green chlorophyll. As the chlorophyll stops being produced, the other colors can shine through.”
The kind of color that the leaves are going to change to is determined by the plant’s genetic (基因的) background. In some places, the leaves start changing color in September — before autumn even officially begins. In other places, they don’t change until late October or even November. Some scientists say the leaves have been changing color later than usual in recent years. And they think global warming has something to do with that.
In one study, researchers found that the growing season in the Northern Hemisphere was nearly a week longer, on average, in 2008 than it was in 1982. And a professor from Harvard University found that the leaves, west of Boston, Massachusetts, are changing color about three days later than they used to. However, other scientists disagree with the global warming theory. Susan Rose said the leaves in her part of Colorado are changing “right on schedule.” But the leaves in other parts of that state are running a little late. “The lateness in the mountains may have something to do with the really warm late summer and early fall,” she said. “But I’m afraid that’s just a guess.”
1.According to Susan Rose, _____.
A．the fall colors are always in leaves
B．leaves make chlorophyll all the seasons
C．leaves’ changing color have nothing to with the weather
D．leaves begin changing color because they start making chlorophyll
2.The underlined word “shrinks” in Paragraph 2 could best be replaced by _____.
A．reduces B．increases C．lasts D．appears
3.Scientists guess leaves change color later than usual probably as a result of _____.
A．genetic background B．dry weather
C．global warming D．low temperature
4.The purpose of the last paragraph is to tell readers _____.
A．why leaves change color at fall
B．leaves change color at different time
C．the effects of the global warming on plants
D．different opinions on the lateness of leaves’ changing color
高一英语阅读理解中等难度题
It’s a sure sign that summer is over and winter is on the way — leaves that were once deep green turn red, yellow and bright orange. It happens every autumn. But did you ever wonder why?
The leaves start changing color when the nights start getting longer and the temperature starts getting cooler. Some scientists think that as the number of daylight hours shrinks, the leaves stop making chlorophyll which makes plants green. The reason is that the process of making chlorophyll requires sunlight. But according to horticulture (园艺) educator Susan Rose from Colorado State University, it turns out leaves don’t really change color at all. “The fall colors are actually there all along,” she said. “But they are covered by the green chlorophyll. As the chlorophyll stops being produced, the other colors can shine through.”
The kind of color that the leaves are going to change to is determined by the plant’s genetic (基因的) background. In some places, the leaves start changing color in September — before autumn even officially begins. In other places, they don’t change until late October or even November. Some scientists say the leaves have been changing color later than usual in recent years. And they think global warming has something to do with that.
In one study, researchers found that the growing season in the Northern Hemisphere was nearly a week longer, on average, in 2008 than it was in 1982. And a professor from Harvard University found that the leaves, west of Boston, Massachusetts, are changing color about three days later than they used to. However, other scientists disagree with the global warming theory. Susan Rose said the leaves in her part of Colorado are changing “right on schedule.” But the leaves in other parts of that state are running a little late. “The lateness in the mountains may have something to do with the really warm late summer and early fall,” she said. “But I’m afraid that’s just a guess.”
1.According to Susan Rose, _____.
A．the fall colors are always in leaves
B．leaves make chlorophyll all the seasons
C．leaves’ changing color have nothing to with the weather
D．leaves begin changing color because they start making chlorophyll
2.The underlined word “shrinks” in Paragraph 2 could best be replaced by _____.
A．reduces B．increases C．lasts D．appears
3.Scientists guess leaves change color later than usual probably as a result of _____.
A．genetic background B．dry weather
C．global warming D．low temperature
4.The purpose of the last paragraph is to tell readers _____.
A．why leaves change color at fall
B．leaves change color at different time
C．the effects of the global warming on plants
D．different opinions on the lateness of leaves’ changing color
高一英语阅读理解中等难度题查看答案及解析
Winter is the time of the year________the days are short and nights are long．
A．on which B．that C．when D．where
高一英语选择题中等难度题查看答案及解析
Winter is coming, and some parts of the world are already covered with deep snow. The best way to warm those cold hands is a cup of hot sweet chocolate. Hot chocolate has been used for many years to treat diseases and fight bad moods. It’s known as a special healthy drink from the 16th to 19th centuries, and sometimes was taken as a medicine. Nowadays people don’t consider hot chocolate as a medicine, but drink even more than ever! There are plenty of tasty and healthy hot chocolate recipes(烹饪法) you can try to enjoy the following health benefits of drinking hot chocolate.
It improves your brain power
The study shows that drinking hot chocolate can help improve your brain power and your brain health. The flavonoids (类黄酮) in hot chocolate increase the blood flow and oxygen to your brain, helping you think better. If you want to improve your memory, try drinking two cups of hot chocolate a day. Not only will you improve your memory, but your mood as well. Just make sure you don’t use too much sugar in your hot chocolate.
It improves your mood
Chocolate, including hot chocolate, is well-known mood booster. This tasty drink helps fight stress, anxiety, and depression. But the problem is, hot chocolate may contain high amounts of sugar. Consider making sugar-free hot chocolate to get all its mood-improving properties(特性).
It can help you lose weight
If you are trying to drop a few pounds, drinking hot chocolate can help you achieve your weight loss goal. When made correctly, hot chocolate is a delicious and low calorie drink that you can enjoy every time you have chocolate desire. Besides, drinking a cup of low calorie hot chocolate helps prevent the intake of high-calorie and sugar foods like cakes.
Now that you’re aware of some of the best health benefits of drinking chocolate, what are you waiting for? Rush into your kitchen and make this fantastic winter drink.
1.Hot chocolate is popular in winter because .
A. it can make your cold hands warm
B. it has been used for many years
C. it was used to treat kinds of illnesses
D. it is regarded as the healthiest drink
2.In the passage the author mainly talks about .
A. different hot chocolate recipes
B. materials used to make hot chocolate
C. side effects from drinking chocolate
D. benefits of drinking hot chocolate
3.It can be inferred from the passage that .
A. hot chocolate is the only way to improve mood
B. most people can be addicted to chocolate
C. remember never to have sugar in drink
D. food in low calorie makes you healthy
高一英语阅读理解中等难度题查看答案及解析
You signed up for soccer, and played every game of the season. Sure, you're not the best player on the team, but most days you gave it your all. Do you deserve a trophy (奖杯)?
If the decision is up to Carol Dweck, the answer would likely be no. She's a psychology professor at Stanford University, California. She says a player doesn't have to be the best to get a trophy. But those who receive an award should have to work for it. She suggests trophies go to the most improved player, or the one who contributed most to the team spirit, as well as to those who play the best.
“The trophy has to stand for something,” Dweck told TFK. “If we give a trophy to everyone, then the award has no value.” Dweck argues that giving kids trophies for particular reasons, such as improving in a sport, teaches kids that adults value hard work and trying our best.
Others say that there's no harm in giving awards to all kids who play a sport, regardless of how they played or whether or not they improved.
“I think we should encourage kids' participation in sports,” says Kenneth Barish, a psychology professor at Weill Cornell Medical College, in New York City. “A trophy is one way to encourage kids' efforts.”
Barish argues that when we single out only the best or even the most improved players with a trophy, we are teaching kids the wrong lesson. We are sending the message that winning is everything. “Winning is only part of the equation (等式),” Barish told TFK. “Playing sports also teaches kids about teamwork and the importance of exercise.”
There will be plenty of opportunities for kids to learn about competition as they get older, says Barish. They'll soon realize that only one soccer team wins the World Cup and only one football team wins the Super Bowl. For now, he thinks there's nothing wrong with letting all kids who play a sport feel like winners. That means trophies for everyone.
1.According to Carol Dweck, which player should receive a trophy?
A.Tony, the most attractive player of the soccer team.
B.David, a soccer player who is both clever and funny.
C.Peter, who is ready to help his partners to score goals.
D.Jim, a soccer player who tries his best to win the game
2.Which of the following statements would Kenneth Barish agree with?
A.There is no sense in giving a trophy to everyone.
B.Kids fond of playing sports should be rewarded.
C.Kids should be given trophies for trying their best.
D.It is necessary to encourage kids' participation in sports.
3.The underlined phrase “single out” in Paragraph 6 probably means “________”．
A.honor B.choose
C.value D.stress
4.What is the best title of the passage?
A.Who deserves a trophy? B.All kids deserve a trophy
C.What does a trophy deserve? D.Best player deserves a trophy
高一英语阅读理解中等难度题查看答案及解析
Both the summer and the winter Olympic Games are held every four years on a _______ basis.
A．magical B．regular C．familiar D．logical
高一英语单项填空中等难度题查看答案及解析
Both the Winter and Summer Olympics are held ___________on a regular basis.
A. every four years B. four years
C. for four years D. every fourth year
高一英语单项填空中等难度题查看答案及解析
It’s school time again! You’re probably feeling excited and maybe a little sad that summer is over. Some kids feel nervous or a little scared（害怕） on the first day of school because of all the new things: new teachers, new friends, and even a new school. Luckily, these “new” worries only stick around for a little while. Let’s find out more about going to a new school.
Most teachers kick off the new school year by introducing themselves and talking about all the stuff you’ll be doing that year. Some teachers give students a chance to tell something about themselves to the rest of the class, too. When teachers do the talking on the first day, they often go over classroom rules and school rules so you’ll know what’s allowed and what’s not. Please pay close attention
You might already know a lot of people in your classes on the first day, but it’s a great day to make a new friend, so try to say hello to kids you know and new ones that you don’t. Make the first move and you’ll be glad you did, and so will your new friend!
Seeing friends you haven’t seen for some time can make the first day a good one. You can make the day feel special by wearing clothes that you really like. Maybe you got a great T-shirt on one of your vacations, or a pair of sneakers（运动鞋）. It also can make you feel good to be prepared and have all the things you need, such as pencils, folders, and whatever else you’ll be needing. But make sure that you pack them the night before in case you don’t have time in the morning.
1.The underlined phrase “kick off” in the second paragraph probably means “_____”.
A．start B．study C．find D．teach
2.The last paragraphs mainly tell us about ________.
A．what to know about a new school
B．how to prepare for a new school
C．what to do on your first day of school
D．how to spend your first day of school
3.According to the passage you usually do everything on the first day of school except _______.
A．introduce yourself B．learn about the school rules
C．make new friends D．go over your new lessons
4.If you happen to see an old friend on the first day of school, from the passage we know that you will feel ________
A．nervous B．lucky C．happy D．excited
高一英语阅读理解中等难度题查看答案及解析
It's school time again! You're probably feeling excited and maybe a little sad that summer is over. Some kids feel nervous or a little scared on the first day of school because of all the new things: new teachers, new friends, and even a new school. Luckily, these “new” worries only stick around for a little while. Let's find out more about going to a new school.
Most teachers kick off the new school year by introducing themselves and talking about all the stuff you'll be doing that year. Some teachers give students a chance to tell something about themselves to the rest of the class, too. When teachers do the talking on the first day, they often go over classroom rules and school rules so you'll know what's allowed and what's not. Please pay close attention.
You might already know a lot of people in your classes on the first day, but, it's a great day to make a new friend, so try to say hello to kids you know and new ones that you don't. Make the first move and you'll be glad you did, and so will your new friend!
Seeing old friends can make the first day a good one. You can make the day special by wearing clothes that you really like. Maybe you got a great Tshirt on one of your vacations, or a pair of sneakers (运动鞋). It also can make you feel good to be prepared and have all the things you need, such as pencils, folders, and whatever else you'll be needing. But make sure that you pack them the night before in case you don't have time in the morning.
1.The last paragraph mainly tells us about ________.
A．what to know about a new school
B．how to prepare for a new school
C．what to do on your first day of school
D．how to spend your first day of school
2.According to the passage, you usually do everything on the first day of school except ________.
A．introducing yourself
B．learning about the school rules
C．making new friends
D．going over your new lessons
3.If you happen to see an old friend on the first day of school, from the passage we know that you will feel ________.
A．nervous B．unlucky
C．happy D．upset
4.Where can you read the passage?
A．In a newspaper. B．In a scientific report.
C．In a notice. D．In a freshman handbook.
高一英语阅读理解中等难度题查看答案及解析
It’s school time again! You’re probably feeling excited and maybe a little sad that summer is over. Some kids feel nervous or a little scared on the first day of school because of all the new things: new teachers, new friends, and even a new school. Luckily, these “new” worries only stick around for a little while. Let’s find out more about going to a new school.
Most teachers kick off the new school year by introducing themselves and talking about all the stuff you’ll be doing that year. Some teachers give students a chance to tell something about themselves to the rest of the class, too. When teachers do the talking on the first day, they often go over classroom rules and school rules so you’ll know what’s allowed and what’s not. Please pay close attention
You might already know a lot of people in your classes on the first day, but it’s a great day to make a new friend, so try to say hello to kids you know and new ones that you don’t. Make the first move and you’ll be glad you did, and so will your new friend!
Seeing friends you haven’t seen in a while can make the first day a good one. You can make the day feel special by wearing clothes that you really like. Maybe you got a great T-shirt on one of your vacations, or a pair of sneakers（运动鞋）. It also can make you feel good to be prepared and have all the things you need, such as pencils, folders, and whatever else you’ll be needing. But make sure that you pack them the night before in case you don’t have time in the morning.
1.The underlined phrase “kick off” in the second paragraph probably means “_____”.
| A．start | B．study | C．find | D．teach |
2. The last paragraphs mainly tell us about ________.
| A．what to know about a new school |
| B．how to prepare for a new school |
| C．what to do on your first day of school |
| D．how to spend your first day of school |
3.According to the passage you usually do everything on the first day of school except ______.
| A．introduce yourself | B．learn about the school rules |
| C．make new friends | D．go over your new lessons |
4. If you happen to see an old friend on the first day of school, from the passage we know that you will feel ________.
| A．nervous | B．lucky | C．happy | D．excited |
高一英语阅读理解中等难度题查看答案及解析
Beijing will host the 2022 Winter Olympic Games, which is the first city _____ both Summer and Winter Olympics.
A. hosting B. to host
C. having hosted D. to have hosted
高一英语单项填空简单题查看答案及解析