[阅读理解]Two United Nations agencies warned on Tuesday that children are most at risk of developing skin cancers as a result of the long-term decline in the earth‘s protective ozone layer. The agencies， the World Health Organization(WHO)and the UN Environmental Programme(UNEP)， issued the warning as they launched a global programme aimed at alerting schools to the dangers of exposure to the sun.
Why does the risk of developing skin cancers in children become greater and greater
A、Because they pay little attention to their skin health.
B、Because they are short of physical training.
C、Because the earth‘s protective ozone layer declines year after year.
D、Because the earth is getting warmer and warmer.
[阅读理解]“Longer life would give us a chance to recover from our mistakes and promote long term thinking，” says Dr Gregory Stock of the University Of California School Of Public Health. “It would also raise productivity by adding to the year we can work.”
Longer lives don‘t just affect the people who live them. They also affect society as a whole. “We have war， poverty， all sorts of issues around， and I don’t think any of them would be at all helped by having people live longer，” says US bioethicist Daniel Callahan. “The question is ‘What will we get as a society’s suspect it won‘t be a better society.”
Which of the following is NOT mentioned as one of the things that living longer might enable an individual to do
A、Spending more time with his family.
B、Having more education.
C、Realizing more dreams.