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题型:阅读理解-阅读单选 难度:0.65 引用次数:233 题号:12759795

Physical activity is important in preventing cardiovascular(心血管的) disease in young people so long as they don’t undertake very intense activity on days when air pollution levels are high, according to a recently released study.

Until now, little has been known about the relationships between the health benefits of physical activity taking place outdoors and the potentially harmful effects of air pollution. Previous research by the authors of the current study had investigated the question in middle-aged people at a single point in time, but this is the first time that it has been investigated in young adults aged between 20—30 years over a period of several years. In addition, the researchers wanted to see what happens when people increase or decrease their physical activity over time.

At each health check-up, the participants completed a questionnaire asking about their physical activity in the past seven days and this information was changed into units of metabolic equivalent task(MET, 代谢当量任务) minutes per week(MET-mins/week). The participants were divided into four groups: 0, 1—499, 500—999 and 1000 or more MET-mins/week. People are recommended to do 500—999 MET-mins/week and this can be achieved by; for example, running, cycling or hiking for 15—30 minutes five times a week, or brisk walking, doubles tennis or slow cycling for 30—60 minutes five times a week.

The researchers used data to calculate annual average levels of air pollution, in particular the levels of small particulate matter that are less than or equal to 10 or 2.5 microns in diameter, known a PM10 and PM25.

Overall, the results show that physical activity is associated with a lower risk of developing cardiovascular disease among young adults. However, when air pollution levels are high, exercising beyond the recommended amount may offset or even reverse the beneficial effects. The study cannot show that air pollution causes the increased cardiovascular risk, only that it is associated with it.

1. What can we know from Paragraph 2?
A.Outdoor physical activity harms our health.
B.Exercising isn’t advised on serious air pollution days.
C.A first in-depth survey has been done on young adults.
D.Middle-aged people have been the ideal research target.
2. How do the results come out?
A.By doing research on young adults.
B.By collecting PM10 and PM2.5 data.
C.By making experiments on middle-aged people.
D.By studying a questionnaire on physical activity.
3. What do we know about the result?
A.Air pollution leads to cardiovascular disease.
B.Cardiovascular disease relates to air pollution.
C.More physical exercise benefits young people.
D.Young adults seldom develop cardiovascular disease.
4. What would be the best title for the passage?
A.Physical activity & air pollution: when to do more or less physical activity.
B.Physical activity & health benefit: how to prevent cardiovascular disease
C.Physical activity & air pollution: what to do with high air pollution levels
D.Physical activity & health benefit: how to maximize the health benefits of exercising

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【推荐1】If you wake up with a headache, your morning may be not pleasant. Some health experts help explain what causes these early-morning headaches and what you can do to wake up with a clear head.

Mind-racing anxiety

    1    . Anxiety is a leading cause of pain and sickness in the body. From tense jaws to even tenser headaches and anxiety, although psychological, they can have real, physical effects. Deep breathing exercises or meditation before bed, as well as a quick ten-minute meditation in the morning will help reset your thoughts and keep any daily stress at bay.

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Both lacking sleep and getting too much sleep can cause head pains. The catch is that people who have headaches are up to eight times more likely to suffer from sleep disorders, making it even tougher to address the root of the problem. Looking at social media late into the night can cause unhealthy sleep patterns.     3    .

Awkward sleep position

Sleeping in an unusual position can result in muscle strain in the head and neck area, leading to morning headaches.     4    . Find a pillow that feels soft yet supportive for the position that you sleep in.

Caffeine withdrawal (脱瘾)

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● Try to limit our news consumption

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Coronavirus seems scary and it’s OK to recognize that our anxiety is normal, while ignoring our stress will only make the anxiety worse. If someone asks us to stop feeling anxious, we can respond with, “Well, what are you doing to be prepared?” If they still insist on minimizing our fears, try to brush them off. Listen to our own voice and gain inner peace from it.

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