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What does the passage mainly talk about?
What does the passage mainly talk about?
admin
2018-06-30
55
问题
What does the passage mainly talk about?
A growing number of apps, such as London Air and AIRNow, are available for metropolitan residents worried about air pollution. Most air-quality apps rely on official daily indices. These are typically designed to alert their users to the immediate effect of various pollutants, which for most people are significant only when pollution is extremely high. In Britain’s index, for example, the concentration of nitrogen dioxide above which pollution is classified as "moderate" is set at a level where it becomes, according to the WHO, "a toxic gas which causes significant inflammation of the airways".
The resulting dichotomy between daily and long-term health advisories can be huge, according to an analysis of a year’s worth of data. In London, for example, the daily index says air pollution is low on about six out of seven days. But daytime levels of nitrogen dioxide exceed the WHO’s one-year limit almost 80% of the time. Similarly, France’s index tells Parisians that the quality of the air they breathe is "good" or "very good" on about four out of five days — whereas the levels of nitrogen dioxide, particulate matter or both are above that annualised limit during 82% of daytime hours. In fact, the harm from chronic exposure to amounts of pollution that are typical for many rich-world cities can include asthma, heart disease and lung cancer. In children it can lead to stunted growth of the lungs, heart and brain.
选项
A、The air quality index are not reliable as anticipated.
B、The air quality in France is worse than that of London.
C、There is a big difference between daily report and annual report.
D、Nitrogen dioxide and particulate matter are the pollutants in the report.
答案
C
解析
综合上下文我们可以知道说话人举两个城市的例子就是想告诉听者,即使每天空气质量播报的情况十分理想,就全年的情况来看,污染指数也相当高,因此选项C的内容与原文大意相符。
转载请注明原文地址:https://kaotiyun.com/show/yg0O777K
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