Sitting around doing nothing used to seem like one of the safest activities possible.Then a few years ago scientists discovered that sitting all day causes many metabolic（新陳代謝的） changes that together increase your odds of meeting an early end.Even regular workouts didn't prevent the ill effects of having your bottom in a chair all workday.Suddenly，sitting became public health enemy number one.
New research offers a hopeful answer to this question，finding that tiny bursts of intense activity are enough to protect your body from the worst effects of your couch potato lifestyle.The study，which was conducted by researchers at the University of Texas at Austin closely observed eight young，healthy volunteers as they sat around.On the first day of the experiment they simply sat for six hours.On the second day they got up from their lazing each hour and engaged in five rounds of four seconds of intense exercise on a specialized exercise bike.
Twenty seconds of total exercise an hour sounds like nothing，but the data showed it made a big difference to the subjects' bodies.The next day they burned more fat and showed lower levels of triglycerides（甘油三酸酯） in their blood.In short，they didn't exhibit the usual ill effects of having sat all day.
And while the research used a special type of bike developed by sports scientists，the researchers feel similar results are obtainable with everyday home exercise equipment.However，you may have to work for a few more seconds to reach the same level of intensity，depending on what type of exercise you choose.
The research still offers an actionable takeaway for business owners and others who are concerned about how much sitting they've been doing all day long. "When you find yourself sitting for most of the day，try to rise frequently and move，preferably intensely，as often during the day as possible and for as many seconds as you can manage，" explains wellness writer Gretchen Reynolds in The New York Times.
（1）What was the focus of the discovery made a few years ago？ DD
A．The causes of early death.
B．The safest modern-day activities.
C．The benefits of regular workouts.
D．The harmful effects of inactivity.
（2）How did the researchers study the volunteers？ CC
A．By observing their usual lifestyle.
B．By testing the triglycerides in their diets.
C．By comparing their physical conditions over two days.
D．By asking them to ride a specially-designed bike for two days.
（3）What do the research results suggest？ BB
A．The health benefits of biking have long been ignored.
B．Interrupting sitting with short intense exercise is helpful.
C．Everyday home exercise equipment is worth investing in.
D．Getting the heart pumping to its maximum quickly is bad.
（4）What's the author's intention of quoting the remarks of Reynolds？ DD
A．To express a concern.
B．To provide a comment.
C．To offer an example.
D．To make a suggestion.
【答案】D；C；B；D
【解答】
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發(fā)布：2024/5/27 14:0:0組卷：6引用：2難度：0.5
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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．
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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
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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 -
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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.
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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.
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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
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