Do you live next to a busy road, train track or even under a flight path? If so, it could have an effect on the size on your waistline. A new study has shown facts about the effects of noise pollution on obesity.

Researchers believe that main roads, which often have increased noise pollution from traffic, could have an effect on peoples' sleeping patterns. Lack of sleep causes reduced energy levels, which can then lead to a more sedentary lifestyle and make people less willing to exercise.

The research, published in the British Medical Journal (BMJ), found those who live under a flight path or near an airport were most likely to suffer from weight problems as a result of noise pollution. The study also found that for every five-decibel increase above the standard traffic noise level, the average person gains an extra 0.2cm on their waist measurement.

Andrei Pyko, lead author of the study at Sweden's Karolinska Institutet, said: "Increasing evidence points to traffic noise as a risk factor for cardiovascular diseases such as hypertension, myocardial infarction and stroke. Recent findings suggest that traffic noise may also affect the metabolic system, for example, inducing central obesity and type 2 diabetes."

According to the study of 5,075 men and women in Sweden, central obesity is associated with exposure to railway and aircraft noise. Participants in areas with lower noise levels were more likely to have lived 10 years or more at the same address. Those exposed to higher noise levels were more likely to be single and report current smoking, psychological distress and noise annoyance.

Dr Pyko said: "Sleep disturbances may affect immune functions, influence the central control of appetite and energy expenditure as well as increase circulating levels of the stress."

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1.How did the writer begin this article?

A By giving an example.

B By asking a question.

C By explaining a fact.

D By discussing an effect.

解析：选B。B。推理判断题。根据文章第1段第1句的Do you live next to a busy road, train track or even under a flight path? If so, it could have an effect on the size on your waistline.可以得知该文章是以一个问题开始的。

2.If people adopt “a more sedentary lifestyle”, they will ______.

A eat more and more food

B exercise less and less

C become happier and happier

D endure more and more noise

解析：选B。B。词意推测题。根据第2段最后一句的and make people less willing to exercise可以得知采取a more sedentary lifestyle的人更加不愿意运动。

3.Noise pollution from traffic will make people suffer from ______.

A lack of sleep

B high energy level

C weight loss problem

D working more slowly

解析：选A。A。细节理解题。根据第2段第1句的could have an effect on peoples' sleeping patterns可以得知噪音污染会让人缺少睡眠。

4.Which of the following is NOT the disease that noise may cause?

A Hypertension.

B Myocardial infarction.

C Stroke.

D Severe fever.

解析：选D。D。根据第4段第1句的such as hypertension, myocardial infarction and stroke可以得知没有提到severe fever；故该题的正确答案为D。

5.What is the main idea of passage 5?

A People’s heath in Sweden.

B The railway and aircraft noise.

C The harm of noise pollution

D Smoking and psychological distress

解析：选C。C。文章第5段be single and report current smoking, psychological distress and noise annoyance可以得知瑞典人是因为噪音污染而受到的伤害。