Summer is here, and with it comes a chance you'll get too much sun. While there's no cure for sunburn, a small but fascinating new study suggests taking large amounts of vitamin D after exposure may prevent the associated redness and inflammation (发炎).
In the paper, researchers exposed 20 volunteers to a light resembling solar radiation to induce a sunburn on a small piece of skin. They then gave the ''burn victims'' large amounts of vitamin D, and followed up with participants one, two and three days (and a week) later to measure skin redness and thickness. The researchers found that vitamin D decreased inflammation and redness, compared with taking a placebo (安慰剂). And this effect increased in proportion to how much was consumed. Vitamin D also appears to increase the activity of a gene called arginase-1, which is involved in tissue repair and healing. Taking 50, 000 international units (IU) of vitamin D--125 times the recommended daily allowance-led to a significant reduction in redness and inflammation, compared with the placebo. Those who took 100,000 IU had even less redness and pain; and those who took 200, 000 IU had the greatest reduction in inflammation.
This is the first study to show vitamin D can reduce inflammation, and suggests that it ''could potentially help prevent sunburn, '' says senior author Kurt Lu, a physician scientist and assistant professor at Case Western Reserve University.
It used to be thought vitamin D was primarily involved in building healthy bones and muscles, but recent research has found it has many more roles, including influencing inflammation, such as the kind associated with sunburns.
So, if you get burned, should you take a lot of vitamin D? The study authors don't recommend it. ''I think that's probably not a good idea and not well established by this study, '' says Barbara Gilchrest, a physician scientist at Massachusetts General Hospital. Such large amounts, if taken repeatedly, have the potential to cause vitamin D toxicity (毒性).
1.What does this passage mainly talk about?
A.An unusual method for relieving sunburn.
B.Tips for how to travel safely in summer.
C.A suggestion on taking vitamin D properly.
D.Advice on how to take medicine effectively.
2.How do the researchers confirm the healing effect of taking vitamin D?
A.By observing the inflammation of skin every day.
B.By measuring the thickness of skin after a week.
C.By increasing the daily volume of vitamin
D.By comparing the effect with that of placebo.
3.Figures are used in paragraph 2 in order to ______.
A.recommend the daily intake
B.argue against the benefits of more Vitamin D
C.show the more Vitamin D, the greater benefits
D.stress the potential danger of too much Vitamin D
4.What can be inferred about the function of vitamin D?
A.Repeatedly taking large amounts of Vitamin D is beneficial.
B.Vitamin D may bring more advantages to us than what has been found out.
C.Don't take vitamin D unless your doctor approves you to do it.
D.Vitamin D is more useful for curing sunburn than building healthy bones.
高三英语阅读理解中等难度题
Summer is here, and with it comes a chance you'll get too much sun. While there's no cure for sunburn, a small but fascinating new study suggests taking large amounts of vitamin D after exposure may prevent the associated redness and inflammation (发炎).
In the paper, researchers exposed 20 volunteers to a light resembling solar radiation to induce a sunburn on a small piece of skin. They then gave the ''burn victims'' large amounts of vitamin D, and followed up with participants one, two and three days (and a week) later to measure skin redness and thickness. The researchers found that vitamin D decreased inflammation and redness, compared with taking a placebo (安慰剂). And this effect increased in proportion to how much was consumed. Vitamin D also appears to increase the activity of a gene called arginase-1, which is involved in tissue repair and healing. Taking 50, 000 international units (IU) of vitamin D--125 times the recommended daily allowance-led to a significant reduction in redness and inflammation, compared with the placebo. Those who took 100,000 IU had even less redness and pain; and those who took 200, 000 IU had the greatest reduction in inflammation.
This is the first study to show vitamin D can reduce inflammation, and suggests that it ''could potentially help prevent sunburn, '' says senior author Kurt Lu, a physician scientist and assistant professor at Case Western Reserve University.
It used to be thought vitamin D was primarily involved in building healthy bones and muscles, but recent research has found it has many more roles, including influencing inflammation, such as the kind associated with sunburns.
So, if you get burned, should you take a lot of vitamin D? The study authors don't recommend it. ''I think that's probably not a good idea and not well established by this study, '' says Barbara Gilchrest, a physician scientist at Massachusetts General Hospital. Such large amounts, if taken repeatedly, have the potential to cause vitamin D toxicity (毒性).
1.What does this passage mainly talk about?
A.An unusual method for relieving sunburn.
B.Tips for how to travel safely in summer.
C.A suggestion on taking vitamin D properly.
D.Advice on how to take medicine effectively.
2.How do the researchers confirm the healing effect of taking vitamin D?
A.By observing the inflammation of skin every day.
B.By measuring the thickness of skin after a week.
C.By increasing the daily volume of vitamin
D.By comparing the effect with that of placebo.
3.Figures are used in paragraph 2 in order to ______.
A.recommend the daily intake
B.argue against the benefits of more Vitamin D
C.show the more Vitamin D, the greater benefits
D.stress the potential danger of too much Vitamin D
4.What can be inferred about the function of vitamin D?
A.Repeatedly taking large amounts of Vitamin D is beneficial.
B.Vitamin D may bring more advantages to us than what has been found out.
C.Don't take vitamin D unless your doctor approves you to do it.
D.Vitamin D is more useful for curing sunburn than building healthy bones.
高三英语阅读理解中等难度题查看答案及解析
With the summer vacation coming around, many school 1._____________
leavers feel it the great chance to enjoy themselves. Most 2._____________
of my classmate have plans to travel, which can broaden 3._____________
their views and add up to their life experience. There are 4._____________
also some students would like to work as volunteers in 5._____________
the communities. Beside, quite a few students want to learn 6._____________
to drive, dance or cook with attending summer classes. 7._____________
As for me, I am looking forward to spend this precious time 8._____________
with my family before I left for my college. Hopefully, I can 9._____________
do something in return for our parents' love and care. 10._____________
高三英语短文改错中等难度题查看答案及解析
It_____ have been Tom that parked the car here, as he is the only one with a car.
A. may B. can C. must D. should
高三英语单项填空中等难度题查看答案及解析
Our boss is too strict with us. I can’t _____ in with the work situation here.
| A．fit | B．get | C．make | D．take |
高三英语单项填空中等难度题查看答案及解析
Look! Here _____. Let’s get on it.
A. is coming a bus B. comes a bus C. a bus is coming D. a bus comes
高三英语单项填空中等难度题查看答案及解析
When you get a job interview, it is the chance that you impress them employer and prove you really are the right person for the job. The following key points may he the important steps you can take to ensure you make a good impression from the get-go
Be Prepared
Research the company thoroughly before the job interview. Read through the company website to gain a thorough understanding of what“ does its values, clients or audience and any technologies it uses. You should also Google the company and read any press releases. Note important issues or points you can discuss at the interview. Take copies of the job description with you to the interview. Don't he afraid of showing off, you can bet the other candidates won't be holding back!
Interview Questions
All this preparation work will go a long way to helping you for questions you might be asked during the interview. As well as preparing for the standard questions, you also need to come up with relevant questions to ask the interviewer about the company and your role. You may want to ask something along the lines of "what's it like to work here?",
“what are the career prospects l like?"
Timekeeping
Plan your route in advance and make a dry run to the interview location a few days beforehand to make sure you're clear on where you're going. Print out directions and maps from sites like Google Maps and make sure you should he there without any problems
After the Interview
If you're unsuccessful, use it as an opportunity to improve. Ask for feedback from the interviewer. This will improve your future interview success chances; the interviewer might consider you for future vacancies at the company based on this action alone
1.What should you do at a job interview?
A. Recognize who is the right employer
B. Have a good impression of the employer
C. Find a chance to show your talent off
D. Impress the employer with good behavior.
2.Which question can you ask the interview?
A. What interests you when you work?
B. What is the information about your clients?
C. What is the promising future of the company?
D. What advice will you offer to the interviewees?
3.It can be inferred form the passage that____.
A. the interviewer can help you through the back door
B. a polite attitude can help you find a way out
C. it is impossible to get a job at the first interview
D. it is important to keep cautious about an interview
高三英语阅读理解中等难度题查看答案及解析
It is freezing here． Wear your coat, ______ you’ll catch a cold．
A． or B． so C． but D． and
高三英语单项填空简单题查看答案及解析
—Mum，can I go on a holiday with my classmates this summer vacation?
—OK．You have a chance if you get along well with your studies．
A．could B．shall C．might D．must
高三英语单项填空简单题查看答案及解析
It was a hot summer day. My dad and I were getting ready to go out for a ride on the boat with my friend Katie and the dog when the phone call came, the call that made that bright, beautiful day a cold, dark, gloomy one.
I had just put on my suit, shorts, and tank top, and packed my bag with sunscreen and everything else I would need for the day. I ran into my parents' room to find Dad. When I saw him on the phone, he was crying. I'd never seen my dad cry before. My heart sank. What possibly could have happened?
"Max, I'm so sorry," I heard him say. That's when it hit me. I knew that Suzie had died.Max has been my dad's best friend for years. Suzie, his daughter, had a rare disease that mainly affected her body. Her brain was OK. She knew what was going on; she knew that shehad problems and was different from other kids. Once she told her dad that she wished she could die and be born in a different body. Yet although she couldn't live a normal life ，she was still happy.
When Suzie and I were little, we spent quite a bit of time together. As we grew up, we grew apart. She lived in New York, and I lived in the Midwest. When Suzie was ten she had to live ina hospital in Virginia. About eight months before she died, Max gave us her number at the hospital and we talked at least twice a week until the end. Suzie was always so excited to talk to us and wanted to know every detail about my life. She wanted to know everything I did and every thing I ate. In a way, she lived through me.
After we found out about her death, we made our plans to go to New York for the funeral. When she was alive, I sent her a Beanie Baby and she sent one back to me. I had bought her another one but never had the chance to send it to her, so I took it to put in her casket(棺材).
Her funeral was very different from any funeral I'd ever been to. After they lowered her casket, each one of us put a shovelful of dirt over her. I remember crying so hard, I felt weak. My cheeks burned from the tears. My whole body was shaking as I picked up the shovel, but I'm glad I did it.
When Suzie and I first started calling one another, I thought it would be more of a burden on me, but I was completely wrong. I learned so much from her. She gave me more than I could ever give to her. I will never forget her or the talks we had. I now know that I must never take anything for granted especially my health and the gift of life.
1.The author's family cancelled their ride because______.
A．Katie couldn't join them for the ride
B．the weather was too terrible for a ride
C．they couldn't find their dog
D．Max's daughter passed away
2.What does the underlined part “In a wav, she lived through me.” mean?
A．Suzie got to know what life outside hospital was like by sharing my experience.
B．Suzie was financially dependent of me.
C．Suzie managed to pull through her illness with the help of my family.
D．Suzie was too weak to live her own life.
3.Which of the following is TRUE according to the text?
A．Suzie was the only person helping the author with difficulties.
B．The author feared that she might also get the same disease as Suzie.
C．The author benefited a lot from talking on the phone with Suzie.
D．The author didn't understand Suzie was her true friend until Suzie's death.
4.What is the most important lesson the author learned from Suzie's death?
A．Never let go of a friend even if you are apart.
B．Be thankful for what we have in our life.
C．Talking with a friend can cure your illness.
D．We can learn more from our friends than they do from us.
高三英语阅读理解中等难度题查看答案及解析
It was a hot summer day． My dad and I were getting ready to go out for a ride on the boat with my friend Katie and the dog when the phone call came, the call that made that bright, beautiful day a cold, dark, gloomy one．
I had just put on my suit, shorts, and tank top, and packed my bag with sunscreen and everything else I would need for the day． I ran into my parents' room to find Dad． When I saw him on the phone, he was crying． I'd never seen my dad cry before． My heart sank． What possibly could have happened?
"Max, I'm so sorry," I heard him say． That's when it hit me． I knew that Suzie had died． Max has been my dad's best friend for years． Suzie, his daughter, had a rare disease that mainly affected her body． Her brain was OK． She knew what was going on; she knew that she had problems and was different from other kids． Once she told her dad that she wished she could die and be born in a different body． Yet although she couldn't live a normal life ，she was still happy．
When Suzie and I were little, we spent quite a bit of time together． As we grew up, we grew apart． She lived in New York, and I lived in the Midwest． When Suzie was ten she had to live in a hospital in Virginia． About eight months before she died, Max gave us her number at the hospital and we talked at least twice a week until the end． Suzie was always so excited to talk to us and wanted to know every detail about my life． She wanted to know everything I did and every thing I ate． In a way, she lived through me．
After we found out about her death, we made our plans to go to New York for the funeral． When she was alive, I sent her a Beanie Baby and she sent one back to me． I had bought her another one but never had the chance to send it to her, so I took it to put in her casket（棺材）．
Her funeral was very different from any funeral I'd ever been to． After they lowered her casket, each one of us put a shovelful of dirt over her． I remember crying so hard, I felt weak． My cheeks burned from the tears． My whole body was shaking as I picked up the shovel, but I'm glad I did it．
When Suzie and I first started calling one another, I thought it would be more of a burden on me, but I was completely wrong． I learned so much from her． She gave me more than I could ever give to her． I will never forget her or the talks we had． I now know that I must never take anything for granted especially my health and the gift of life．
1.What does the underlined part “In a way, she lived through me．” mean?
A．Suzie got to know what life outside hospital was like by sharing my experience．
B．Suzie was financially dependent of me．
C．Suzie managed to pull through her illness with the help of my family．
D．Suzie was too weak to live her own life．
2.Which of the following is TRUE according to the text?
A．Suzie was the only person helping the author with difficulties．
B．The author feared that she might also get the same disease as Suzie．
C．The author benefited a lot from talking on the phone with Suzie．
D．The author didn't understand Suzie was her true friend until Suzie's death．
3.What is the most important lesson the author learned from Suzie's death?
A．Never let go of a friend even if you are apart．
B．Be thankful for what we have in our life．
C．Talking with a friend can cure your illness．
D．We can learn more from our friends than they do from us．
高三英语阅读理解中等难度题查看答案及解析