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Most schools ban chewing gum, but in a few years they might consider changing that rule. Why? Scientists are finding evidence that gum chewing may be good for your health. It may even help boost your test scores.

This exciting research is just beginning. And in the meantime, companies are also experimenting with adding vitamins, minerals, medicines, and other substances that could give gum the power to cure headaches and fight everything from serious diseases to bad breath. Many studies have shown that chewing gum after meals can stimulate the production of saliva (唾液). Saliva helps wash away bacteria (细菌) that damage our teeth.

Nutritionist Gil Leveille, executive director of the Wrigley Science Institute, says that chewing gum might also be good for your brain. One Japanese study of nine participants, found that chewing gum boosted the flow of blood to participants’ brains by up to 40 percent. Blood carries oxygen, which fuels brain cells.

Other small studies have found that people perform better on memory tests while chewing gum. And a study in the United Kingdom found that people who chewed gum while memorizing a list of words did about 25 percent better at recalling those words than people who didn’t chew gum.

“It certainly makes sense,” Leveille says, “that increased blood flow would be related to increased alertness.”

“Additional studies, with longer follow-up, are needed to confirm that chewing gum has benefits, ”he adds. So far, results of studies about memory have been mixed. What’s more, many of the studies that show gum’s benefits are funded by gum companies. “Too much chewing can damage the jaw joint,” warns Gayl Canfield, a researcher at the Pritikin Longevity Centre. “What’s more, no matter how healthy gum chewing proves to be,” she adds, “it will never be a match for a healthy lifestyle.”

【小题1】What is the new finding of chewing gums?
A.It is beneficial to our teeth.B.It can boost our test scores rapidly.
C.It can cure various diseases.D.It may benefit people’s health.
【小题2】What is Leveille’s attitude to the benefits of chewing gums?
A.Negative.B.Uncertain.C.Objective.D.Supportive.
【小题3】How may chewing gums benefit brain?
A.Gums contain vitamins good for brain.
B.Chewing gums promotes blood flow in brain.
C.Chewing gums may improve people’s memory.
D.Gums may kill bacteria that damage brain cells.
【小题4】Which of the following is a suitable title for the text?
A.New Findings in HealthB.Chewing for Your Health
C.Protecting Teeth with GumsD.Gums Boosting Test Scores
21-22高二下·广西贺州·阶段练习
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Sleep problem may happen in many people. Good news is that people can actually“Train”their brains to fall asleep.

1. Make a schedule, and stick to it

Melatonin(褪黑素)is a hormone produced by the body to regulate when you get sleepy and when you wake up. As night approaches, levels of melatonin rise, becoming a signal to the body that it’s time for bed. To work properly, the release of this hormone needs to occur at regular times.【小题1】 .

2. 【小题2】.

“The best sleep tip you can ever give somebody is get up - don’t lay in bed awake but not sleeping,” clinical psychologist and sleep expert Michael Grandner said. Why is that so important?【小题3】. Instead of being a restful spot where you peacefully fall asleep, your bed becomes an anxious place where you toss and turn and wake up tired. What you need to do is to go to bed extra early and the bed has the power to help overcome your racing mind and allow you to fall asleep.

3. Change your attitude about sleep

Many people view sleeping as the final thing they have to do in a busy day, worth delaying to finish the housework, schoolwork, office work or the latest television series. 【小题4】. “Don’t see your sleep as the amount of time you have left in your day,” he advised. “See your sleep as the amount of time you need in order to set yourself up for a productive tomorrow.”

It may sound like a small shift in thinking, but it’s important. Most adults need between seven and eight hours of sleep to be fully rested, according to the US Centers for Disease Control and Prevention. So if a person needs to rise at 7 am each day, he would require a bedtime of 11 pm. When you have to stop and get ready to go to bed, do it without hesitation.【小题5】.

A.Go to bed early and get up early.
B.Don’t lay in bed awake.
C.Otherwise, it will makes the next day more stressful.
D.Because lying in bed awake can form an association in your brain that can lead to long-time sleep problem.
E.Because lying in bed awake may make you more tired when getting up.
F.Therefore, it’s important to have a standard wake up time, even on weekends or vacations.
G.That thinking needs to be changed.

Annoying snoring can be prevented

An American researcher has developed a simple device to help people stop snoring. The device limits the movements of the tissue(组织)that caused the disliked sound. Snoring is a common problem. It may prevent a person from getting enough sleep. It may also prevent enough oxygen from reaching the heart and lungs during the sleep. But for most people snoring affects relations with the other person who must sleep in the same room.

Snoring happens when the sleeping person breathes with the mouth open. In the back of the mouth the tissues surrounding the entrance of the throat are soft. As the person breathes, the movement of the air around the soft tissues caused them to move or vibrate(振动). This tissue movement causes the sound we call snoring. A number of possible solutions have been suggested. Some devices keep the mouth shut. They forced the patient to breathe only through the nose. A medical operation is also possible. Other devices listen for the sound of snoring and then wake the patient. The new anti-snoring device was developed by a dentist, George Wagner at the Indiana University School of Dentistry. He developed a piece of plastic that fits up against the inside of the mouth. The device keeps the soft tissues from vibrating and making the snoring noise. It was worn only at night. Doctor Wagner said several patients report that the simple device has ended their snoring problem.

【小题1】The underlined word “snoring” probably means “________”.
A.speaking while one sleepsB.dreaming while one sleeps
C.noises made while one sleepsD.sighs made while one is asleep
【小题2】Which of the following statements is NOT true according to the passage?
A.Snoring may affect one’s roommates.
B.Snoring may lead to slower heartbeat.
C.Snoring may cause one’s lack of oxygen.
D.Snoring may prevent one from having enough sleep.
【小题3】From the passage we know that the simplest and more efficient way to prevent a person from snoring is ________.
A.to keep the soft tissues from vibrating
B.to give the patient a medical operation
C.to wake him/her up as soon as he/she snores
D.to make him/her listen to the sound of snoring
【小题4】How many possible ways to stop snoring have been mentioned in paragraph 2?
A.Two.B.Three.C.Four.D.Five.

You’ve most likely heard the news by now: A car-commuting, desk-bound, TV-watching lifestyle can be harmful to our health. All the time that we spend rooted in the chair is linked to increased risks of so many deadly diseases that experts have named this modern-day health epidemic the “sitting disease”.

Sitting for too long slows down the body’s metabolism (新陈代谢) and the way enzymes (酶) break down our fat reserves, raising both blood sugar levels and blood pressure. Small amounts of regular activity, even just standing and moving around, throughout the day is enough to bring the increased levels back down. And those small amounts of activity add up—30 minutes of light activity in two or three-minute bursts can be just as effective as a half-hour block of exercise. But without that activity, blood sugar levels and blood pressure keep creeping up, steadily damaging the inside of the arteries (动脉) and increasing the risk of diabetes, heart disease, stroke, and other serious diseases. In essence, fundamental changes in biology occur if you sit for too long.

But wait, you’re a runner. You needn’t worry about the harm of a sedentary lifestyle because you exercise regularly, right? Well, not so fast. Recent studies show that people spend an average of 64 hours a week sitting, whether or not they exercise 150 minutes a week as recommended by World Health Organization (WHO). Regular exercisers, furthermore, are found to be about 30 percent less active on days when they exercise. Overall, most people simply aren’t exercising or moving around enough to counteract all the harm that can result from sitting nine hours or more a day.

Scared straight out of your chair? Good. The remedy is as simple as standing up and taking activity breaks.

【小题1】What is the best way to bring down high blood sugar level and blood pressure?
A.Interrupting sitting time with light activity as often as possible.
B.Exercising for 150 minutes or more every week.
C.Getting rid of the habit of car commuting and TV watching.
D.Standing or moving around for at least two or three minutes every day.
【小题2】What does the word “sedentary” in the third paragraph most likely meant?
A.Modern.B.Risky.C.Epidemic.D.Inactive.
【小题3】Which of the following may be inferred about those who do serious exercise?
A.They usually do not meet the standard of exercise recommended by WHO.
B.They generally spend less time sitting than those who are inactive.
C.They tend to stand or move around less on their work-out days.
D.They often live longer than those who don’t exercise.
【小题4】What is the passage mainly about?
A.The threat to our health from long hours of sitting.
B.The challenges of the modern lifestyle.
C.The reasons for the spread of a modern epidemic.
D.The effect of regular exercise on our body.

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