Eating too much fatty food, exercising too little and smoking can raise your future risk of heart disease. But there is
another factor that can cause your heart problems more immediately: the air you breathe.
Previous studies have linked high exposure (暴露)to environmental pollution to an increased risk of heart problem,
but two analyses now show that poor air quality can lead to heart attack or stroke (中风)within as little as a few hours
after exposure. In one review of the research, scientists found that people exposed to high levels of pollutants (污染物)were up to 5% more likely to suffer a heart attack within days of exposure than those with lower exposure. A separate
study of stroke patients showed that even air that the U. S. Environmental Protection Agency (EPA) considers to be of "moderate" (良好)quality and relatively safe for our health can raise the risk of stroke as much as 34% within 12 to 14
hours of exposure.
The authors of both studies stress that these risks are relatively small for healthy people and certainly modest
compared with other risk factors such as smoking and high blood pressure. However, it is important to be aware
of these dangers because everyone is exposed to air pollution regardless of lifestyle choices. So stricter regulation
by the EPA of pollutants may not only improve environmental air quality but could also become necessary to
protect public health.
A. inform
B. persuade
C. describe
D. entertain
A. The food the tigers ate.
B. The place where the tigers were trained.
C. The process(过程) to train the tigers.
D. The time it took to train the tigers.
Do you have a passion for helping others reach their nutrition, fitness and wellness goals? If so, a
career in the fitness and nutrition field may be right for you. The following are some careers for you to
choose.
Dietitian
Dietitians are responsible for improving the nutritional health of patients by assessing nutritional
needs and creating healthy diet plans based on nutritional needs and weight loss goals. Dietitians hold
employment through hospitals, private medical practices, public health and outpatient centers. A
bachelor"s degree in dietetics (营养学) or food and nutrition and state certification are required to
become a dietitian.
Personal trainer
Personal trainers are responsible for helping their clients (主顾) reach weight loss and fitness goals.
No formal, education is required to become a personal trainer; however, certification is mandatory
(必要的). Traditionally, personal trainers hold employment through gyms and fitness centers.
Yoga instructor
Yoga instructors direct their students to physical and mental well-being. To become a yoga instructor,
you must become a registered yoga teacher. Completion of the program ranges from 200 hours to 500
hours. According to Payscale.com the average hourly wage of a yoga instructor with one to four years
of experience ranges from $17.50 to $34.50.
Wellness coach
A wellness coach guides clients towards improving their overall nutritional, physical and mental health. Wellness coaches are typically serf-employed. There are no formal education requirements to become a
wellness coach, However, expert knowledge and experience in the field lend great credibility (可信度).
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