A case highlights a little-known fact about a poor diet：In addition to being tied to obesity.jye.ai disease and cancer，they can also permanently damage the nervous system，particularly-vision，according to a report published in the journal Annals of Internal Medicine.
A teen who ate nothing but fries，chips and other junk food for years slowly went blind.The teen's problems began at age 14，when he went to the doctor's office complaining of tired-ness.The teen was reportedly a picky eater.jye.ai blood tests showed he had anemia and low levels of vitamin B12.He was treated with injections of vitamin B12 along with advice on how to improve his diet.
However，by age 15，he developed hearing loss and vision problems，but doctors couldn't seem to find the cause-results from an MRI and eye exam were normal.Over the next two years，the teen's vision got progressively worse.When the boy was 17，an eye test showed that his vision was 20/200 in both eyes，the threshold（起始點(diǎn)）for being "legally blind" in the United States.
Further tests showed the teen had developed damage to the optic nerve（視神經(jīng)）.In addition，the teen still had low levels of vitamin B12，along with low levels of selenium（硒）and vitamin D.These deficiencies caused doctors to ask the teen about the foods he ate. "The patient admitted that，since elementary school，the only things he ate had been fries，chips，white bread，processed ham slices and sausage，" the authors from the University of Bristol in the United Kingdom wrote in the report.
This kind of vision loss is potentially reversible（可逆的）if caught early.However，by the time the teen was diagnosed，his vision loss was permanent.What's more，wearing glasses would not help the teen's vision，because damage to the optic nerve cannot be corrected with lenses ，said the study lead author Dr.Denize Atan.
（1）What does the text mainly talk about？ AA
A．A poor diet can cause poor vision.
B．Vitamin Bl2 is important to vision.
C．Unhealthy food causes many diseases.
D．Doctors' advice is helpful to people.
（2）Why did the teen's condition get worse？ BB
A．His illness couldn't be treated.
B．He kept having a poor diet.
C．Vitamin Bl2 didn't work on him.
D．He developed damage to his nerves.
（3）What does the underlined word "deficiencies" in paragraph 4 mean？ DD
A．Barriers.
B．Materials.
C．Reasons.
D．Shortages.
（4）What can be inferred about the teen？ DD
A．His optic nerve will be recovered.
B．His problems will be solved well.
C．He is advised to take in more nutrition.
D．He needn't wear glasses any more.
【答案】A；B；D；D
【解答】
【點(diǎn)評(píng)】
聲明：本試題解析著作權(quán)屬菁優(yōu)網(wǎng)所有，未經(jīng)書(shū)面同意，不得復(fù)制發(fā)布。
發(fā)布：2024/4/20 14:35:0組卷：66引用：7難度：0.5
相似題
-
1．How to Improve Your Memory The human brain is extremely complex and powerful． （1）
Here are 3 simple things that will help you improve your memory and keep it going strong into your old age．
Get plenty of exercise and rest．
Exercise isn't just good for your physical body，but it is also good for your brain．Exercise increases the amount of oxygen that gets to your brain．（2）When you exercise，your brain produces certain chemicals that help to protect your brain cells．Rest is also an important part of improving your memory．Studies show that key memory improvement happens when you are in those deep stages of sleep，so go to bed early every night．
Have a good laugh as often as you can．
Not only is laughter good for the soul，it is also good for the brain and can help improve your memory．
（3）This helps you to learn more and be more creative．So，go ahead and belt out a good laugh．Not only will others join you，but you will feel much better after doing it．
（4）
Stress has a bad effect on your body，especially the brain．If you let stress stay，it can destroy your brain cells and cause damage to the part of the brain responsible for creating new memories and remembering old ones．So，stay away from stress．It's bad for you．If you are feeling a little stressed，go outside and take a little walk around． （5）
A．Avoid stress．
B．Change your behavior．
C．It also helps to reduce memory loss
D．This will make you feel ten times better．
E．When you laugh you excite many areas of your brain．
F．The health of your brain directly shows how strong your memory is．
G．The human brain is like a muscle and can be trained．發(fā)布：2025/1/1 17:30:2組卷：0引用：2難度：0.5 -
2．Winter is often bitterly cold，which often makes us stay indoors more instead of heading out to exercise．Worse still，there are many viruses doing their best to make you sick．And sneezing，coughing and nose blowing make the rooms a habitat for viruses． （1）
．Touching a doorknob or shaking a hand may make you get sick．Although it may sound terrible，there are still some things you can do to avoid viruses．Here are several simple tips to stay healthy in winters．
Wash your hands
You pick up viruses everywhere and they live on your hands，so wash your hands and do it often．（2）But if that's not available，use an alcohol-based hand sanitizer （消毒殺菌劑）．
（3）．Avoid touching your eyes，nose and mouth with your hands．That's one way viruses can get into your body．
Get the flu shot （疫苗）
（4），but getting the flu shot lowers your chances of getting the flu．For example，getting the flu shot last year resulted in a 34% lower risk of coming down with the flu．
Avoid sick people
（5）．Viruses spread very easily through the air，so keep at least six feet between you and the sneezing，sniffling and coughing person．
A．It's no guarantee
B．Take care of your face
C．Keep your hands away from your face
D．The best way is to use regular soap and water
E．It is easy for viruses to spread from person to person
F．If someone around you is sick，then keep your distance
G．Because there are always some unexpected things in life發(fā)布：2025/1/1 15:0:2組卷：13引用：4難度：0.5 -
3．What is cross country running？Cross country is an outdoor endurance（耐久性）sport that can be mentally challenging and fun.（1）
You're not only putting one foot in front of the other；you're also thinking ahead to barriers and changes in the trail or course.
（2）However，before you begin training and racing，you should be aware of potential injuries and how to avoid them.How can you prevent cross country running injuries？The best ways for outdoor runners to stay healthy include the following running tips：
Stretch daily.For all runners and athletes，a regular stretching routine is an important part of conditioning.（3）
Warm up and cool down.Muscles and tendons（跟腱）are less likely to overstretch or tear if they've been properly prepared for running and racing.High-intensity workouts require more prep and post-workout cool down than low-impact activities.
Wear the right shoes.Make sure your shoes fit properly and that they are neither too tight-fitting nor too loose.（4）
Eat and drink enough.Competitive distance runners like to keep their weight low.However，consuming too few calories can harm your body，especially if you're a girl or woman subject to eating disorders.（5）It's effective to prevent injury and heat illness.Remember that especially in full sun or in humid regions of the state，you particularly tend to have heat stroke.Drink plenty of water before and after running.
A.Cross country running is a sport requiring money.
B.Tie double-knots to prevent tripping over undone laces.
C.It's mostly very safe in comparison to other team sports.
D.Have a well-balanced diet and be sure to stay well-hydrated.
E.You may encounter unexpected，non-natural barriers.
F.It is needed to keep your bones，joints，and muscles healthy.
G.This type of running and racing has both a physical and psychological role.發(fā)布：2025/1/1 15:30:1組卷：3引用：2難度：0.5
把好題分享給你的好友吧~~