【正确答案】
B
【答案解析】[解析] 14-16
The ozone layer, which protects life on Earth from damaging solar radiation, became an overnight sensation in 1985, when three British scientists revealed that aerosol chemicals had torn a hole in the layer over the South Pole.
[14]Today, the ozone hole doesn't make headlines like it used to. The size of the hole has stabilized, thanks to decades of aerosol-banning legislation. But, scientists warn, some danger still remains.
First, the good news: Since the 1989 Montreal Protocol banned the use of ozone-depleting chemicals worldwide, the ozone hole has stopped growing. Additionally, the ozone layer is blocking more cancer-causing radiation than any time in a decade because its average thickness has increased, according to a 2006 United Nations report.
Now the bad news: [15]The ozone layer has also thinned over the North Pole. This thinning is predicted to continue for the next 15 years due to weather-related phenomena that scientists still cannot fully explain, according to the same UN report. And, [16]repairing the ozone hole over the South Pole will take longer than previously expected, and won't finish until between 2060 and 2075. Scientists now understand that the size of the ozone hole varies dramatically from year to year, which complicates attempts to accurately predict the hole's future size.
So even though environmentally friendly laws have successfully reversed the trend of ozone depletion, the lingering effects of aerosol use, and the link between the ozone hole and global warming, virtually ensure that this problem will persist until the end of the century.
[读题] 题干表明，本题是问为什么臭氧层空洞不再像过去那样是敏感话题了。
细节题。文中提到，如今臭氧层空洞已经不会再成为报纸的头条(doesn't make headlines like it used to)，因为它的大小范围已经趋于稳定(has stabilized)，这源于数十年来立法禁止使用气雾剂的努力(decades of aerosol-banning legislation)，由此可知答案为B)。