(
课件网) 阅读理解A Sound is measured in decibels(dB) (分贝). There are many sounds in the environment, from rustling leaves(20 dB)to a normal conversation(60 dB), from a screaming baby(80dB) to a subway train(100 dB). Sounds that reach 85 dB or higher can harm a person's ears. Permissible Exposure Time How long can a person be exposed to a certain sound before risking hearing damage According to the National Institute for Occupational Safety and Health, for every 3 dB sound Pressure level over 85 dB, the permissible exposure time is cut in half—before damage to Our hearing can occur. (第二段) 21. What is the permissible exposure time to the noise of a subway train A. 8 hours. B. 1 hour. C. 30 minutes. D. 15 minutes. Sound Pressure Level Permissible Exposure Time 85 dB 8 hours 88 dB 4 hours 91 dB 2 hours Four Commonest Types of Noise Pollution ● Road vehicles are one major source of noise pollution. This is more concentrated in urban areas where there is a much higher number of vehicles. ● Fireworks, used generally for celebrations, are beautiful. However, they can be very loud, and scary! There is no real way of dealing with it, as fireworks are used so briefly. ● Construction work cause loud and disturbing noises which can make it hard to concentrate. Most countries have laws in place preventing construction work from taking place between certain times. ● Animals also cause noise pollution. For example, if you live on a road where somebody keeps their dog outside for hours on end while it barks constantly, that's really annoying. 22. Which type of noise pollution already has legal restrictions in most countries A. Road vehicles. B. Fireworks. C. Construction work. D. Animals. Obviously, noise pollution is a widespread issue. But the consequences of this pollution are often underestimated. According to WHO estimates, at least 1 million healthy life-years are lost annually from traffic-related environmental noise alone in western Europe. It is time that the effects of noise pollution on public health receive more attention. 23. What does the author imply in the last paragraph A. There is a lack of attention to public health. B. Noise pollution is most serious in western Europe. C. Noise pollution has become the deadliest pollution. D. There is insufficient awareness of the harm of noise pollution. 阅读理解B I remember when I started telling people about my upcoming solo(独自的)travel to Mongolia, I was met with surprise and often confusion. My manager at the time gave me a funny look and warned me against going there. I didn’t panic. I’d done my research. Mongolia wasn’t as dangerous as people thought—in fact, it’s far safer than a lot of more frequented countries, like South America. (第一段) 24. What does the author say about Mongolia A. It is hardly accessible. B. It is suitable for solo travel. C. It is a popular destination. D. It is safer than people think. The thing about Mon ... ...
