B When your skin gets burned, it’s not only painful; it’s bad for your body. Burned skin cannot keep the bacteria out, so infections are common. Doctors often wrap burns in bandages for protection, but a recent study shows that a new kind of bandage can actually fight infection. Toby Jenkins, a scientist in England, worked on the study. Jenkins and his colleagues developed a material that contains tiny capsules . To a bacterium, these capsules look like cells just waiting to be damaged. The bacteria attack the cells by releasing poisons. But when the bacteria attack the capsules, the capsules fight back - by releasing antibiotics that knock out any nearby bacteria. The material was tested on two types of harmful bacteria. When researchers placed pieces of the new material in a dish with the bacteria, the bacteria barely grew at all, which is unusual. This observation led the researchers to believe that the material really works. The scientists want the bandages to work specifically against dangerous bacteria, so they also tested the material on a harmless type of E. coli bacteria. When the material was placed in a dish with E. coli, the bacteria grew quickly - showing that it didn’t fool the harmless bacteria. This early experiment shows that the material can selectively kill dangerous bacteria, but it’s too early to start using the material in hospitals. “This is a nice approach and they’ve shown in principle that it works, said Christopher Batich, a biomedical engineer in the US, who did not work on the study. While he’s excited about the results, he added that the real world is more complicated than this experiment. “You’d have to work with real bacteria and real wounds to see if it makes a difference, he said. Jenkins and his colleagues are back at work improving the material. In the not-so-distant future, this kind of antibacterial bandage may move from the laboratory to the hospital bed - and give burned victims a fighting chance against infection. 40. What’s the purpose of this passage? A. To talk about ways of preventing skin infections. B. To remind the readers to avoid being burned. C. To focus on a new medical research. D. To introduce Toby Jenkins and his career. 41. According to the passage, the capsules’ appearance . A. can fool the harmless bacteria only B. shows what the cells look like in our body C. can cause the harmful bacteria’s aggressive behavior D. can make the harmful bacteria kill themselves 42. It can be inferred from the passage that E. coli bacteria probably . A. made no attacks on the cell-like capsules B. fought against some harmful bacteria C. protected burned victims from infection D. released antibiotics themselves 43. Which of the following is TRUE according to the passage? A. Once your skin gets burned, your body will get infected. B. The capsules can kill harmful bacteria with poisons. C. E. coli bacteria are less harmful than the other two types of bacteria. D. Burned patients will benefit from the new kind of bandage. 【查看更多】

 

题目列表(包括答案和解析)

CHICAGO (Reuters) - Smoking not only can wrinkle (起皱纹) the face and tarn it yellow—it can do the same to the whole body, researchers reported on Monday.

The study, published in the Archives of Dermatology, shows that smoking affects the skin all over the body—even skin protected from the sun.

"We examined non - facial skin that was protected from the sun, and found that the total number of packs of cigarettes smoked per day and the total years a person has smoked were linked with the amount of skin damage a person experienced," Dr.Yolanda Helfrich of the University of Michigan, who led the study, said in a statement.

"In participants older than 65 years, smokers had significantly more fine wrinkling than nonsmokers.Similar findings were seen in participants aged 45 to 65 years," Helfrich "s team added in their report.

The researchers tested 82 people, smokers and nonsmokers, taking pictures of the inner right arms. They ranged, in age from 22 to 91 and half were smokers.Independent judges decided how wrinkled each person' s skin was.

When skin is exposed to sunlight, notably the face, it becomes coarse, wrinkled and discolored with a pale yellow tint, Helfrich ' s team wrote.

Several previous studies have found that cigarette smoking contributes to premature(过早的)skin aging as measured by facial wrinkles, the study said, but little has been done to measure the aging of skin not exposed to light.

The report did not discuss die mechanism involved but previous research has found that cigarette smoke, among other things, causes blood vessels (血管) beneath the skin to constrict (紧缩), reducing blood supply to the skin.

Smoking can also damage the connective tissue that supports both die skin and the internal organs,.

When your skin is exposed to sunlight long, it-becomes all of the following but _____.

    A.flexible     B.coarse           C.rough        D.discolored

How wrinkled a person's skin is doesn't relate to _____.

    A.the number of cigarettes a person smokes.    

    B.the kind and characteristics of skin

    C.how long a person smokes              

    D.how long skin is under sunlight

From the passage smoking results in skin aging mainly because _____.

    A.it will lower blood supply to skin                  

    B.it can make you feel tired

    C.it can make skin come off                       

    D.it can make blood run faster

The main purpose of the passage is to _____.

    A.inform people about the result of the study         

    B.advise people how to protect skin

    C.warn people not to smoke again                  

    D.introduce a new way of avoid skin aging

查看答案和解析>>

CHICAGO (Reuters) - Smoking not only can wrinkle (起皱纹) the face and tarn it yellow—it can do the same to the whole body, researchers reported on Monday.

The study, published in the Archives of Dermatology, shows that smoking affects the skin all over the body—even skin protected from the sun.

"We examined non - facial skin that was protected from the sun, and found that the total number of packs of cigarettes smoked per day and the total years a person has smoked were linked with the amount of skin damage a person experienced," Dr.Yolanda Helfrich of the University of Michigan, who led the study, said in a statement.

"In participants older than 65 years, smokers had significantly more fine wrinkling than nonsmokers.Similar findings were seen in participants aged 45 to 65 years," Helfrich "s team added in their report.

The researchers tested 82 people, smokers and nonsmokers, taking pictures of the inner right arms. They ranged, in age from 22 to 91 and half were smokers.Independent judges decided how wrinkled each person' s skin was.

When skin is exposed to sunlight, notably the face, it becomes coarse, wrinkled and discolored with a pale yellow tint, Helfrich ' s team wrote.

Several previous studies have found that cigarette smoking contributes to premature(过早的)skin aging as measured by facial wrinkles, the study said, but little has been done to measure the aging of skin not exposed to light.

The report did not discuss die mechanism involved but previous research has found that cigarette smoke, among other things, causes blood vessels (血管) beneath the skin to constrict (紧缩), reducing blood supply to the skin.

Smoking can also damage the connective tissue that supports both die skin and the internal organs,.

1.When your skin is exposed to sunlight long, it-becomes all of the following but _____.

   A.flexible        B.coarse                           C.rough     D.discolored

 

2.How wrinkled a person's skin is doesn't relate to _____.

   A.the number of cigarettes a person smokes.    

   B.the kind and characteristics of skin

   C.how long a person smokes              

   D.how long skin is under sunlight

3.From the passage smoking results in skin aging mainly because _____.

   A.it will lower blood supply to skin                 

   B.it can make you feel tired

   C.it can make skin come off                          

   D.it can make blood run faster

4.The main purpose of the passage is to _____.

   A.inform people about the result of the study        

   B.advise people how to protect skin

   C.warn people not to smoke again                     

    D.introduce a new way of avoid skin aging

 

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阅读下列材料, 从所给的六个选项(A、B、C、D、E 和 F)中, 选出符合各小题要求的最佳选项。选项中有一项是多余选项。
A. Prepare for Rainy Days                B. Watch Your Spending
C. Get Aggressive                     D. Start Saving
E. Set the Goal                          F. Save More
Steps to Retire a Millionaire
Having a million-dollar portfolio is a retirement dream for many people. Making that dream come true requires some serious effort. While success is never a sure thing, the steps outlined below will go a long way toward helping you achieve your objective.
61. ____
Vacations, car, kids and all of life's other expenses take a big chunk out of your paycheck. To maximize your savings, you need to minimize your expenses. Buying a home you can afford and living a lifestyle that is below your means and not funded by credit cards are all necessities if you want to boost your savings.
62. ____
If you don't save, you'll never reach your goal. As obvious as this might seems, far too many people never even start to save. If your employer offers a 401(k) plan, enrolling in the plan is a great way to put your savings on autopilot. Simply sign up for the plan and contributions will be automatically taken out of your paycheck, increasing your savings and decreasing your immediate tax liability.
If your employer offers to match your contributions up to a certain percentage, be sure to contribute enough to get the full match. It's like getting a guaranteed return on your investment. Finding the cash to stash may be a challenge, particularly when you're young, but don't let that stop you from pursuing future riches.
63. ____
Studies have shown that the majority of the returns generated by an investment are dictated by the asset-allocation decision. If you are looking to grow your wealth over time, fixed-income investments aren't likely to get the job done, and inflation can take a big chunk out of your savings.
Investing in equities entails more risk, but is also statistically likely to lead to greater returns. For many of us, it's a risk we have to take if want to see our wealth grow. Asset-allocation strategies can help you learn how to make picking the right mix of securities the core of your investing strategy.
64. ___
Part of long-term planning involves accepting the idea that setbacks will occur. If you are not prepared, these setbacks can put a stop to your savings efforts. While you can't avoid all of the bumps in the road, you can prepare in advance to mitigate the damage they can do.
65. ____
Your income should rise as time passes. You'll get raises, you'll change jobs, and maybe you'll get married and become a two-income family. Every time more cash comes in to your pocket, you should increase the amount that you save. The key to reaching your goal as quickly as possible is to save as much as you can.

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CHICAGO (Reuters) - Smoking not only can wrinkle (起皱纹) the face and tarn it yellow—it can do the same to the whole body, researchers reported on Monday.
The study, published in the Archives of Dermatology, shows that smoking affects the skin all over the body—even skin protected from the sun.
"We examined non - facial skin that was protected from the sun, and found that the total number of packs of cigarettes smoked per day and the total years a person has smoked were linked with the amount of skin damage a person experienced," Dr.Yolanda Helfrich of the University of Michigan, who led the study, said in a statement.
"In participants older than 65 years, smokers had significantly more fine wrinkling than nonsmokers.Similar findings were seen in participants aged 45 to 65 years," Helfrich "s team added in their report.
The researchers tested 82 people, smokers and nonsmokers, taking pictures of the inner right arms. They ranged, in age from 22 to 91 and half were smokers.Independent judges decided how wrinkled each person' s skin was.
When skin is exposed to sunlight, notably the face, it becomes coarse, wrinkled and discolored with a pale yellow tint, Helfrich ' s team wrote.
Several previous studies have found that cigarette smoking contributes to premature(过早的)skin aging as measured by facial wrinkles, the study said, but little has been done to measure the aging of skin not exposed to light.
The report did not discuss die mechanism involved but previous research has found that cigarette smoke, among other things, causes blood vessels (血管) beneath the skin to constrict (紧缩), reducing blood supply to the skin.
Smoking can also damage the connective tissue that supports both die skin and the internal organs,.
【小题1】When your skin is exposed to sunlight long, it-becomes all of the following but _____.

A.flexibleB.coarseC.roughD.discolored
【小题2】How wrinkled a person's skin is doesn't relate to _____.
A.the number of cigarettes a person smokes.
B.the kind and characteristics of skin
C.how long a person smokes
D.how long skin is under sunlight
【小题3】From the passage smoking results in skin aging mainly because _____.
A.it will lower blood supply to skin
B.it can make you feel tired
C.it can make skin come off
D.it can make blood run faster
【小题4】The main purpose of the passage is to _____.
A.inform people about the result of the study
B.advise people how to protect skin
C.warn people not to smoke again
D.introduce a new way of avoid skin aging

查看答案和解析>>

补全对话
根据对话内容, 从方框内的选项中选出能填入空白处的最佳选项, 其中有两个为多余选项.
A:  Hi, Kate. How nice your watch!   1  
B:  An online shop. It's cheap, 89 Yuan.
A:  Only 89 Yuan?   2   Tell me how to do it, please.
B:  OK. That's easy. Just enter the website www.Taobao.com.
A:    3  
B:  Well, first, you need to apply for(申请) a user's passport. Next, go through the shopping list.
A:  And then?
B:  Choose one you like.   4   You will receive it in a few days.
A:  Thank you!   5  
B:  Good luck to you!

A. And I will have a try myself.
B. When did you get it?
C. Sounds great!.
D. Could you tell me in details, please?
E. Click on it and follow the instructions.
F. Where did you buy it?
G. How much is it?.

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