题目内容：
根据以下资料，回答题：
Global Warming
Few people now question the reality of global warming and its effects __51__ the world’s climate. Many scientists put the blame for recent __52__ disasters on the increase in the world’s temperatures and are convinced that, more than ever __53__, the Earth is __54__ risk from the forces of the wind, __55__ and sun. According to them, global warming is making __56__ weather events, such __57__ hurricanes and droughts, even __58__ severe and causing sea __59__ all around the world to rise.
Environmental groups are putting pressure on __60__ to take action to __61__ the amount of carbon dioxide which is given off by factories and power plants, thus attacking the problem at its source. They are in favour of more money being spent on research into solar, wind and wave energy devices, __62__ could then replace existing power stations.
Some scientists, however, __63__ that even if we stopped releasing carbon dioxide and other __64__ into the atmosphere tomorrow, we would have to wait several hundred __65__ to notice the results. Global warming, it seems, is here to stay.
请在___________上，填上正确答案。 A．on
B．as
C．with
D．up
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