Mental health experts are constantly trying to come up with new ways to help people deal with enough sleep, exercising, maintaining a healthy diet, deep breathing, and of course, talking to someone about what’s causing the stress. __1__ According to the study, this can not only reduce stress levels but even relieve pain.
The study, which was conducted jointly by three prestigious North American universities with help from the National Parks Service, was not the first of its kind. __2__ They discovered that hearing the sounds of nature has benefits beyond just stress and pain reduction. It can also improve people’s overall mood and help them focus and
think more clearly.
Two sounds that seem to be particularly calming for people are those of water and birds, although it is not exactly clear why this is. One theory regarding water sounds is that we need water for our survival. __3__ As far as birds go, their sounds are perhaps much less threatening than human-made noises. Thus, people may be more prepared to let their guard down and relax.
One of the best ways to experience the benefits natural sounds offer is to visit a national park. __4__ If more and more people travel to national parks, the level of human-made noise will likely increase accordingly. However, with some bug spray and a nice pair of hiking boots, people should be able to leave the parking lots and campsites behind to enjoy the sounds of nature.
答案： 1. C 2. D 3. B 4. A