It wasn’t until the mid 20th century that doctors realised asthma attacks were caused by the swelling and contraction of the airways, Consequently, in the last 40 years there have been many developments in the treatment of asthma. There are presently two main types of medicine: preventers and relievers. A preventer is used every day and reduces the swelling of the airways, cutting the risk of on attack. A reliever, such as Ventolin, is taken when breathing has become difficult: this actually relaxes the muscles of the airways, reducing constriction and improving the airflow. The medicine is usually taken using a device for medical purpose. Prevention is also good treatment so if you have asthma, remember to keep generally healthy, take regular exercise and lots of vitamin C to avoid colds and flu—which can be dangerous for asthma sufferers. A healthy diet is also important, and do watch what you eat, as certain foods or food with certain substances to change the flavor can start asthma. By taking the right medication and making the right lifestyle choices, there is no reason why most asthma sufferers shouldn’t be able to lead perfectly healthy and active lives.

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Although measured air pollution ranged below current WHO guidelines, a considerable proportion of the adults surveyed rated themselves as annoyed by car fumes (39.7%) or visible dust/soot: exposure (26.9%). Of the mothers (children’s study), 12.2% reported car fumes perceptible most of the time in the exposed area, 5.3% in the unexposed area.In the adult study, a series of factors were significantly associated with the perception of car fumes or dust/soot.

  At the yearly Rottnest Channel Swim in Western Australia, participants often smear their bodies with animal fat for insulation(36) the 70-degree water. But their own body fat also helps to keep them warm, like an extra layer of clothing (37) the skin. When scientists studied aspects of the event in 2006, they found that swimmers (38) a greater body mass index (BMI) appear to be at much (39)risk of getting hypothermia. Under certain conditions, though, overweight people might feel (40) than people of average weight. That’s because the brain combines two signals—the temperature (41) the body and the temperature on the surface of the skin—to determine when it’s time to constrict blood vessels (which (42) heat loss through the skin) and trigger shivering (which (43) heat). And since subcutaneous fat traps heat, an obese person’s core will tend to remain warm (44) his or her skin cools down. According to Catherine O’Brien, a research physiologist with the U.S. Army Research Institute of Environmental Medicine, it’s possible that the lower skin temperature would give (45) people the sense of being colder overall.

46、毕竟，我们总有许多不说实话的理由。

47、政府不得不动用储备并向国外借款。

48、这种液体不可暴露在空气中，因为它会很快蒸发掉。

49、由于粗心大意，他的实验注定要失败。

50、她用皮补丁加固了夹克衫的肘部。

I got five_______my ad about the car for sale.

The government decided to set up a monument_______the soldiers who died in the war.

We must_______the possibility that he is not here because of illness.

In the past, women had to_______social prejudice against them.

The shuttle bus_______commuters at rush hour.

Happiness is not always_______the amount of money.